Malicious PDF — malware analysis report

Static analysis result for SHA-256 3393b86595fa2a9b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 17:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a715c9bcea643d79c6fb50e2d21acec6 SHA-1: 1fd014e8b44e9c7f5b19d0ad2b62f1d615c81a82 SHA-256: 3393b86595fa2a9b6f261af51f8f6ac3161aaab9b4f1a9c83a1d2ead092783c8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8d191b8---jetenusewujar.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/19b2d731db6460646cb0df145dbd15f5/38542802738.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/85938778303.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/31368221198.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e86ce9459---1640668513.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/92176869670.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/doxaliduwukisefoworaler.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/86208051609.pdfIn PDF document text
    • https://ocw.tw/uploads/files/16922385858.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f0dd7b16---jiwidilogidopuwiri.pdfIn PDF document text
    • http://eko-uklid.com/files/file/97587625647.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/wiputagazi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c2291b5f---dugulujiburojejujavo.pdfIn PDF document text
    • http://firegallery.ru/img/upload/69511553344.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-9/20210909025434180307.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kelopilewewu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/lofusexofexidakikiravuki.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5d7c9d8e---lajake.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/27808992656.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/81089387783.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/81652539896.pdfIn PDF document text
    • http://intersonik.eu/upload/files/62717769967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lesson+1+using+properties+of+integer+exponents+answer+keyPDF 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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 19740 bytes
SHA-256: c2fb3ffcc68bef1b052e70666655da6e175080dca7c73516718f7bf9cee047f7
font_02_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 10992 bytes
SHA-256: 37f9ed419646420341b5c370ff14f8d4ecb00442c4f6e8d6743687667e579e87

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