Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8698ae801f5cab…

MALICIOUS

PDF

88.8 KB Created: 2021-08-21 15:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65aff83e6be55f8125a814002b0caab3 SHA-1: 1d66f266a2b307f6276cf57b263719789035a546 SHA-256: 2f8698ae801f5cabcd4ef330afe99def863591bbde25866323e84f7f10878a60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://gphs84.com/clients/866382/File/totimo.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cgdbaj8m9s2076349ats7gqe40/jezetuxisefawadased.pdfIn PDF document text
    • http://446888.top/userfiles/file/43760968013.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ef71342d---26196345092.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/68496010101.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/98ebe3265ca03c87a1039eb868d1635f/zilagukekagudapubijija.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/10761231894.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f14e27adf---3570640260.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/tetodusisasirepime.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dda097b75e4---mogosejagakasegadepiw.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ae21eba230---roragopafanegedor.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/48669083089.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ff6a9efa6738ccd2de8677809f004a54/sawufamebederemep.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/sebafa.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/15iqb22opdk8gfcolskmo2g6j7/gozezeri.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/35055845412.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tumugagifasubagidodaxa.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/gabenekami.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/77357317605.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/66130572249.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/68672992405.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/23807464202.pdfIn PDF document text
    • http://citra.cl/userfiles/file/22524086162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=keto+shopping+list+for+beginners+pdfPDF 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_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 17252 bytes
SHA-256: abdff3523e280c116c1c26c786a06383a33f44dd3f54a23bcab72ceff3fa4794
font_01_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 10744 bytes
SHA-256: a3f10ee6a5bff33874acac185a941a9879f036a22fd0f8847d7da6e79c7cf5a4
font_02_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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