Malicious PDF — malware analysis report

Static analysis result for SHA-256 caac925ef5d9af05…

MALICIOUS

PDF

94.1 KB Created: 2021-09-04 17:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 649fe3dc96effa73e1bfd89d1ef99e74 SHA-1: 30a59aa26b6a04571f9b37c67f843b0fb9e37a23 SHA-256: caac925ef5d9af057dd22d08df1e37b39d324316548dd867c4113c87327e8f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pixomot.ru/uplcv?utm_term=ppm+project+portfolio+management+pdf PDF link annotation
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ff9339i0tqvjmc7l9m2f75n152/14038270866.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fiveba.pdfIn PDF document text
    • https://fobh.net/userfiles/files/fibidipunevedonineneja.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df6fe1a48---74136332079.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/387fb1ccf1464d93609bde827f7894db/vadafexatokewebegubuzukip.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4d867e8cd6a5b15e3f2fa0c80b31c9d0/domumasi.pdfIn PDF document text
    • http://vladekoservis.ru/files/46155308661.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/busepu.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/18966104851.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/93323431062.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d8a9e9a63b01d87f04ec3348a0943c78/52042099207.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/99047675134.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/vixavukikud.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mujegiropelulimu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981cb6f47b---27756580767.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7fbca1b4---94130279350.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/jixijesaw.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/8599055184.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d784f22c3---riberesakibejuvemiju.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/35214433897.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9rhsgeda7jc14eflvkc6qtrm20/mutarupotadujuzites.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5eaf6870c---84233946121.pdfIn PDF document text
    • https://iohrp.org/f_files/files/giwefavogo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8faad7a9a---dunazawokumira.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ee83b9ebddd2df6101ad62901209ea70/58019657309.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_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 18312 bytes
SHA-256: e2eee3e0fcd4c75d4119aea5f5bd7b81ea99497a9035acd62c2866de61fd9da5
font_01_sfnt_off000139d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D4 10928 bytes
SHA-256: b42bb872d78324cbcb70aabaabbc2e553cc52815560fda20de158704e86be52e
font_02_sfnt_off000152db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1