Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d5ec84e30de7af…

MALICIOUS

PDF

88.1 KB Created: 2021-09-09 08:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13d4b1d4321d826994d6865addeb056b SHA-1: 4e7a8d8ec28be9225b9434998ee04b4abc2be4e2 SHA-256: b2d5ec84e30de7af2f2664da832537da9788584398fc516007eb7b10edfa90b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://electriccityusa.com/images/fck_uploads/file/89536572477.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132954f2fa38---lukomotekixepikasowuzol.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/46638209144.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/sosowokinozetamam.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/31474222458.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95f3b5074---3061863032.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163072064649149731293.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/76870771231.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109030518278537.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/dixigabuxefav.pdfIn PDF document text
    • http://thaide.org/userfiles/file/60641795366.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/dulevukugelakokekidenebek.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/fafup.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210905180541.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/fepolenifosusig.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132a27b41263---56221150915.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/55807137864.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139331ddd6f2---40289922039.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/52870441461329ae5c0db5.pdfIn PDF document text
    • http://lagrupacio.cat/file/powom.pdfIn PDF document text
    • http://darec.sk/files/files/mewepeguzena.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/21304499697.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/77545390793.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/70363733980.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/53701205706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+connect+webcam+to+firestickPDF link annotation
    • 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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10760 bytes
SHA-256: 5ef8951c179c3f39613bfd32bc188de3b923632e5084b7422822ebba3ca1f63f
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 17752 bytes
SHA-256: c510f758f3df8fdc1e4d7ccae126534a8c642880fca4d81bc73c76f3634ea95b