Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49b3671107d2c33…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 19:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba5fea712598a080a34225899c346620 SHA-1: 34bdba3429fd51a5d43a2e9d804a9e5128a6d497 SHA-256: d49b3671107d2c33a0962908ab81686ee7d875bcec723ce4518a20034df33a48
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of a 'Download Now' lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=tamil+movie+download+isaimini PDF link annotation
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/74105532568.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/37306725802.pdfIn PDF document text
    • http://electric-kernbichler.at/luzorija.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/59226093729.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/wugubosatijemaxokalura.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432cef20a0---99237685611.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/80043371583.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/74880909711.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/44437184746.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/jovanojuvorifo.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/rajixi.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nofefijowabixe.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/4426573178.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135df4a42a1f---122547211.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614168dd0e363---nidarowupugakovil.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/be0af84b10bcd3933d620178bd557158/boxirolaximivuvo.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/45102858652.pdfIn PDF document text
    • http://petrduchek.com/files/18800847732.pdfIn PDF document text
    • http://nineslash.com/user_file/file/73343312124.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/7508945538.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/wudozusupamejete.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401fa36ffa2---12952619886.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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 10328 bytes
SHA-256: 0989e44a825f1677a54deb9a1abb9d5095326f547459d7bad9736bfbb05ba1a0
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 17692 bytes
SHA-256: fdf86042e40610181cc8b65921a08be1c550b259f7b532853bc203da7f2674c4
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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