Malicious PDF — malware analysis report

Static analysis result for SHA-256 6933c2c3c496f288…

MALICIOUS

PDF

70.5 KB Created: 2021-09-15 14:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc38f3a3c7d53e216390662703f6337a SHA-1: 462aeadbe3e0b5a270e733ade1d42b6f98bf858d SHA-256: 6933c2c3c496f2889f9d2211b156025dbdcc40065d0d85f4b4a0e7264ddcd982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to other PDF files, some hosted on compromised CMS uploads. The `utm_term=launcher+setting+apk` URL suggests a lure for downloading potentially malicious applications.

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 https://irlanc.ru/uplcv?utm_term=launcher+setting+apk
    • https://tapuionoticias.com/ckfinder/files/54891991973.pdf
    • http://ukwoodrecycling.com/userfiles/files/82189535211.pdf
    • http://studiorestagno.eu/userfiles/files/16336047281.pdf
    • https://nationalshield-uae.com/userfiles/files/bedur.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134155366e7b---4854376362.pdf
    • http://fine-trading-knotwork.com/uploads/media/nimusus.pdf
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/86730480918.pdf
    • http://tugrabilgisayar.net/resimler/files/fajir.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130a394051e1---45949619794.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/legezokoxarejugibixa.pdf
    • http://carrozzeriardue.it/userfiles/files/35118170830.pdf
    • https://tcremich.lu/files/files/12493289393.pdf
    • http://leebyenghun.com/new/upload/board/files/84224393461.pdf
    • http://progetec.org/userfiles/files/88970708323.pdf
    • http://familiegravesen.dk/userfiles/file/24984703677.pdf
    • http://www.sudeshnamaulik.com/fckimages/file/molevukoxi.pdf
    • http://okuninka-biale.pl/userfiles/file/nupilamatavugijesegoga.pdf
    • http://ffarchitettura.it/userfiles/files/gifovopijabipuxuzise.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadc8608fa---lobugiwav.pdf
    • http://abwessex.com/uploads/files/kenelapiwojuxu.pdf
    • http://vattucongtrinh.com/userfiles/file/bovamujebexusosivozutix.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/24788074653.pdf
    • http://ippon.lv/uploads/File/84652724013.pdf
    • http://studiosantese.eu/userfiles/files/48344956034.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b457.bin
64173d2564160828d333d73c7c888d1250382666fff37df01b1d58618ea14dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB457 10636 bytes
font_01_sfnt_off0000cca3.bin
4fb47c4ba5aa113ea700273358f91b57edb3e9eec71905af7b922aa19ea7aa80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 15788 bytes
font_02_sfnt_off0000f482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 16792 bytes

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