Malicious PDF — malware analysis report

Static analysis result for SHA-256 083c4c501409510c…

MALICIOUS

PDF

92.0 KB Created: 2021-07-05 10:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bd2d04505d2dd33782fcf70dcbcf5e5 SHA-1: 112a54de33c4d71a9069f1030dccce3aa0674e5b SHA-256: 083c4c501409510c9de0c64c0d1fe33d68ab7bec228c8185fed9ea1229d4b2f6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a downloader for further payloads. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://musorcentrum.hu/files/article/file/lemonusijinexaluvaj.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/35a6af91f136826be121712b9780b8a7/6932896951.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/34ca8cdeb4b1a4bcbfaf6a36196f7405/lotaleriveda.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/relakagorijate.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/27637951083.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be264301e2a---bewamavojid.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924f9887018---mufudarogilefinukilojeta.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/4587375156.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ffbh4oastrkhmf7nko2lvu9rte/midukebonimobosigudopu.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/xosojibo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f4bc88635c354db240b95174d73b4156/33377989489.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a088d172---37026712258.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3be8205df---dapoxalepovukef.pdfIn PDF document text
    • http://prestopc.it/upload/file/98164856312.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ervs44j8gbkio2cc91ot4ko934/gaxalitesewufidinedezotu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g80vusko5sm2sg36b0bhqnfbi1/raxusexowapinusijezo.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/vivode.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e4e0a0ab---29974021949.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/xutogidujewabudoxud.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a601bb31657---46674349642.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e60883a602313c4b1e977f27c8912d5f/velevewazibodavoj.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d442062d---dejew.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/94899166101.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/22926865166.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2651ecf2a5---zimuxubimimowojuxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=electronegativity+bond+type+practice+worksheet+answersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bb966792cf7e47663ab4b8f3a6275ef9/52362818833.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 18516 bytes
SHA-256: f440463fafb7c16042dd0a072511b19574668ca5176e4067d7a8f414e6805736
font_02_sfnt_off0001483b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483B 11276 bytes
SHA-256: dfc3a23663fc88ee61b4e821987bdccfebb28b6e5e8dc45c94d5fd081133b8e3

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