Malicious PDF — malware analysis report

Static analysis result for SHA-256 046b1811fc33f472…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 00:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a376af891bfd20b50e41b24d1e56cba SHA-1: 53f4a3f11527df83906fe03345052df34e1de77a SHA-256: 046b1811fc33f472475e6d56a4a4bdde7605fc236b0cf9c00862c952f7612559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised CMS upload storage, with numerous links to unknown PDF files. While no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f63a51b3b---66284744258.pdf In PDF document text
    • http://rintoyo.com/userfiles/file/93727307742.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/riberusiwawukitopa.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/95955551133.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l1icuda3j6bhvg7hb9tl5rgm62/59266542062.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/todirajelujajiravelu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/19373645959.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/tevufewumamekalemelupa.pdfIn PDF document text
    • https://magerp.org/upload/files/rizubukogikoge.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54767c8ee---digarawiduzax.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072750bb96a8---21923701139.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/vafunajemok.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098c24d933a0---80668543823.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/03e94e65ad33f1f4804ee877dda2e8c1/34485690332.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b0a64e28d0e42c1af6a4443faf4ec595/buxamalemaw.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/221954469740.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/weresebavipozulab.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d0f80936c331c057984825f899d2991c/kogesedupijabaw.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/52473358999.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/72379353620.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fovesaxawerezofo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4ce880d2f---simifinuse.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/gikunebanekovifowevuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=qpdf+concatenate+pdfPDF 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_off0000bcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFF 16096 bytes
SHA-256: e9cf810818202459af7ec54e9b156aa200ea823b5de9a56a7ec270c206ba6828
font_01_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 10268 bytes
SHA-256: ee3e4343e34effead150ccf50bf45a82e0468fdeda74732c29f61c9d3bd7edf9
font_02_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1