Malicious PDF — malware analysis report

Static analysis result for SHA-256 668c9aa49e345114…

MALICIOUS

PDF

73.5 KB Created: 2021-06-11 11:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f3605c85e40c8468b6900e0280b6ed7b SHA-1: b80034feef64d748c970436a1c3cd5e3c42810f8 SHA-256: 668c9aa49e3451141bb2db053f54277ee078812277762cb00e3c3fae8f9ac4e4
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many of which appear to be compromised or hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports the attack pattern of tricking users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=mini+militia+hack+file+download PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507040654978886.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/25266928362.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/luseluxerazika.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/31ad881eb6d74e70b8c7e1dac7bb1e86/17149491505.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5315345f2195495691803784971d26ac/3537989462.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/pepadazerexibosipawe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jfjn7eobe7sbjfkd80tibu9rib/22710803642.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fagonulowapebupusin.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f66b272de---32906687556.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093630947abf---feximiwibapizi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacd83be7d---wurazekorodozeb.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cff78852e3668fafdf8dd08363c2862b/jajaxubegamesarij.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dnhg5m5f1veqvbj8marupukeq7/13543651927.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c63ba84b0---mirabefenezezanirisozo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f7c3ced68b736aef055bbcc99eaf1397/wikibeketunubazafidilud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/xizudozagezukuriruv.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5148 bytes
SHA-256: 1b8994fd4e3adfbe237be43299144a38167c0a62e208895cd050592a25d6e8c3
font_01_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 10868 bytes
SHA-256: d4e600696ede7eeb940652d178df05bffe9eaac7225c7d88498e1ccc8a63727e