Malicious PDF — malware analysis report

Static analysis result for SHA-256 84be2f018ead1fb4…

MALICIOUS

PDF

116.1 KB Created: 2021-06-26 23:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e952fc22e29d995e0e211d325cc7c669 SHA-1: 40c4107688c66c1f0ed06bd7c61dfa0ba6de8172 SHA-256: 84be2f018ead1fb4c1008360af30b743ffee10ae2eadf4471b862705349d8c4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to lead users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a63dbe4fa18---51033093847.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/63618785997.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/diximefife.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607c543134ae4---9409253299.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/89b4790f9b9c51cb3cf3b85e5ce4664e/pefigobebo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bec3b83---putukigonepozebofosifol.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/98024404143.pdfIn PDF document text
    • http://www.centralperdana.com/file/bodeja.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210623063247.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/pulatituwemexefexeberefu.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/53920473192.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bkrpb660t08f2tmdjha8csm852/podigosemunurize.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/rozewavawo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83ddd26c4---98144225498.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b2c08eaa---20327647417.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0b83d92626816f89676837cfd8ebcf16/17273996016.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/49756781448.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0442b45211---foxumikiterizisexa.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606142d38---fozibedul.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fdd9c5ec4e---tonibanapex.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/lagile.pdfIn PDF document text
    • http://gtshotel.it/images/file/2461655300.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nrq7lf5ug5lv6b0kqc60rrh0q5/wenubimepolinemibivo.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/juzuzolonajukudanajipexow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=jet+lee+tamil+dubbed+moviesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 19516 bytes
SHA-256: 877333a91fbdbfcb2f0d434826588036c1a4a61e129208a28c0cc6cad2c59f97
font_01_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 10500 bytes
SHA-256: 6f0b7101947fd735c2507970a09865d60835d149df9b0a98b322554251d24510
font_02_sfnt_off00014422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C30 28532 bytes
SHA-256: 6e937a2f3d0f9c304bfa0bf30ed33bb5ed7b7780172582a9ac68c53f295f7ce1
font_04_sfnt_off0001aabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AABD 16212 bytes
SHA-256: 87088d3577d9d050c4a7591e7606cd6c33fab7e0b2ac80593eae1a57c5dc7e17

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