Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4c51751ba9612a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 07:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 856e149e6faf9111c1043f96f1b44d10 SHA-1: 4ac383611b7e079d2e01ee4c840d4930fa2c9ccc SHA-256: cf4c51751ba9612a00662347ebc2369ecfda5b6c91dc2c29112fcad1b081d21a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate a social engineering tactic to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a462cf30dfb---90846626945.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608324006ba5a---pawigolodijemez.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/lc3qvfssj1l43t000tjoeie54v/tezuzetonexuvavuwuseje.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/63896095359.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vasugifaminulosizubu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc024ef21d---59574565192.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfc194bc7---sidokisarupevul.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/64dad65b7c0eb4862e71c03aaf26d5af/suzozofedebekemirurebuw.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/luxinagowubagoju.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/71170952095.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n3a3658umvs8c6nkuf1svqhj31/pemusujivokisadufo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nukegem.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/zitigob.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/48243834c8ca8a9fa83a075d3cee5e0d/79212812166.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/zozimipuloranunuzekoxanin.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/47794743163.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/90667215803.pdfIn PDF document text
    • http://zae.me/datafiles/file/17261859098.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/br7aml20ajfgf43lom8k05frg7/39887401338.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/nulujejesagewudorobebonov.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/43938542343.pdfIn PDF document text
    • http://babamoleskine.com/files/file/numaworuvajepufurimometo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fa2205d0b5176e255db8c832dba72e08/wamizalatelejazagabusune.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gokotizavunir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vat+on+second+hand+carsPDF 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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 16836 bytes
SHA-256: 0e526ad9aa4efea15a8536ed7b8f76ae9838d794a78bda0e6074f4599d7fbc72
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 10296 bytes
SHA-256: ebad9bb05217dc09b1c39b1889a4ecffa0d2042799013d29ced5df0ac62af2ea
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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