Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e895e7aa234f19…

MALICIOUS

PDF

88.1 KB Created: 2021-09-30 15:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 222d03fe961319758f6d82a5fd640925 SHA-1: 465672d8b770f4920a5e5c8ebfbf3753f35e9ab7 SHA-256: 20e895e7aa234f1941c73fd62e49e99688a6f31f08671fad8038405baa9a408e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content. No scripts were extracted, but the overall structure and link distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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 https://inwebjor.ru/uplcv?utm_term=how+to+block+internet+access+for+specific+apps+in+android+10 PDF link annotation
    • http://webs123.com/userfiles/file/seguxilur.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/tazuzomenonasijajunisad.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/vofalofap.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140f41a7080a---10455119794.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/fiduxibipiluwulepefojolub.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/tomalagefamejel.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec1fcceb3---28601302871.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/21934161493.pdfIn PDF document text
    • http://wdnederland.nl/file/89301320125.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/tegebemigil.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sl2e2a3oiefcki1tcatj65dqc0/dibozorofevumumetawiwa.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/95462394875.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f1240f9d---23598523628.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/tuwuvigexoge.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/98806097466.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/ropozagaresojodi.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/38296601203.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/mevufiwefev.pdfIn PDF document text
    • http://www.moyekolodin.com/files/5418568762.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210927062812.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/31361972500.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/pemuwovagefuw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df5585f819---vinowuk.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/3851964080.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210904235421.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 17400 bytes
SHA-256: 70834797621d84296bbdf755f5d7433aa3dea5764f6b2e946b2df2e9fce6592d
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 11096 bytes
SHA-256: c252b0f6b39be6412cc0853c28d964e55c8ab8fdd12219e9de7f22057557e42d

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