Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b358b6d2ade8b0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 08:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b600e1f58ed1c67e75852a0d8ddd35c7 SHA-1: 7d4d466e25f548ef13f396a41a2e0d306070e79f SHA-256: c7b358b6d2ade8b0a9c5abfa0eba8db5d886e8ce5b972aa1ff4221be5b76a6ea
156 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 identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gzperson.com/uploadfile/files/97902639952.pdf In PDF document text
    • http://movesearchesuk.com/userfiles/file/bibinupirupimonowifo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/bemunidelix.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210917_053238.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/fomemil.pdfIn PDF document text
    • https://jurad.eu/files/file/8739843090.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/bodofotujalija.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131732cbe230---vajadi.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/92014832841.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614912cc110f3---82795392334.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/35122373946.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/89501787625.pdfIn PDF document text
    • https://signika.pl/Upload/file/malosagiz.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/23645569506.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/62718725668.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/51065395096.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/faxezapifuxawizopune.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/78961789237.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/saxalebi.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/dizefosikupelo.pdfIn PDF document text
    • https://spyboarcams.com/files/tezasiwifade.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/79232152962.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/dfa5d6f8818a25567c3f3cffc31a4d7a/sarotivamofuvowawe.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/86125632442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dragon+ball+z+kakarot+download+on+androidPDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10504 bytes
SHA-256: 0b686635a88b162f1790e541ae59548a8e14397f2421cb7c6ef80d6ddad954a1
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 17760 bytes
SHA-256: 89439dbb2e649c221b63de206bced10622ce1e40e5745df230c2d8e7a9709d85
font_02_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1