Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f27ee8df651b325…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 04:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e0420acefb3afb60142bb69fb5968d2 SHA-1: e8aa0731d6bfa7174d02cf9d9d553c7aeeb099ca SHA-256: 4f27ee8df651b32525a4ca2dfec91a271eed492650b495fcc02b23216cfba3b6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters in some URLs suggests tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=marvel+avengers+academy+apk+download PDF link annotation
    • http://bobiniauto.com/userfiles/file/64135699916.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/56960dd323252839ee7fed30e2cd4908/zukixekevatuwiwov.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/38699537047.pdfIn PDF document text
    • http://imbirimbir.ru/files/gijexixikisetefudodudo.pdfIn PDF document text
    • http://www.toptehnik.si/images/4552340954.pdfIn PDF document text
    • http://nprofit.hk/userfiles/89355821383.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3v20u1bbie2q7sn3n8q4331hbh/85041393700.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/41459887304.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/gaxokazimesi.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/suruliwugovewo.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/kisinagulumexowomenaxaret.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/070516341191.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/obkgucd8m18gch62gir264a99g/megubofuvizifojef.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/zaxedexodubenono.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/5390262295.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/kogizuzi.pdfIn PDF document text
    • http://letdentalab.com/img/files/linupe.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/nazobonaxinenuzefemajenoz.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/11366981427.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/18000354659.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/kibanalade.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/99119264669.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/73541939926.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/9736367364.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://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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 11016 bytes
SHA-256: 7efe34385ea74c2c313c92fb62fc0fffb0b780c1e0ac670158be63058d26b3c8
font_02_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 17284 bytes
SHA-256: d8a59c57f882d36bf4ad8ad9f199d011b6d3c9450efa4f4db09c0079112dc569