Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4442e93a56d1b76…

MALICIOUS

PDF

96.4 KB Created: 2021-09-13 01:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65876acfed9c0af21780ed98d2b5585e SHA-1: 60e0b6c0d4374716904bb0f196aa00902d5452b9 SHA-256: a4442e93a56d1b76b825e944dc37b8e39903c6d07dd423aeb9e7cb78e7723028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bytip.net/filespath/files/20210911133629.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4004b9daf---wokudezagidifebafidusip.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/dubozesureli.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/zezupo.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/metekopuzozojazi.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/42162430874.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04f14d14e---powomavokufowojemozixusix.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/33724782857.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/diniresezipofiwo.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/98072487529.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f1b6b0ab---mufilogix.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/piwejagaxabafa.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/99327472886.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/jexodoxodupi.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/mukogirovovataj.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fuwedubilixikepegofalalid.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/6531744729.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/rirovajivikoboxafupo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7128a7f0a4319a4ae588f61d69b2ee22/77520401824.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dd742d87---vafufix.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/sululimosoliw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c454cb358e---suwej.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/69007679951.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/tawumusekor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+gta+san+andreas+for+iphonePDF 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_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 10708 bytes
SHA-256: 40109bc7fb3e33ff698c34e27883717af18e26d067df72f27eb8d46d78010cc4
font_02_sfnt_off0001448f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448F 18388 bytes
SHA-256: be5cce7612719aeded14155d1c63dc3159fbb7ce9606dd57219191a66a87a5cf

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