Malicious PDF — malware analysis report

Static analysis result for SHA-256 481615a68fe9a870…

MALICIOUS

PDF

92.8 KB Created: 2021-09-24 10:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfba1662b9dfa89956676236e3970769 SHA-1: 85a360aeb4e330f8ca7aa50162b3040a674c522c SHA-256: 481615a68fe9a8704407a1b1f8c7f0ab9def158b228f3e96e8a049c24ef61794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=how+to+watch+shakuntala+devi+movie+for+free PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f31854a76d---90769839429.pdfIn PDF document text
    • http://alltechsro.cz/files/nagalenevirisukojasugu.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109082008419444.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/49636717467.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/susuzajoribizu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a0486788---70813056631.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/77598521701.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/funusorosemawetimufa.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/752232b1e48c06185eca22a47cb99f2c/3394961856.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jegibomebeme.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/58944785705.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/mixaroparazazufarezasa.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/47886861366.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8f903a49---nefode.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/626529383.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/14/file/20210914_163451_154.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/70099585571.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/xonana.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nixifurabafosanotabutoke.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/8514507369.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/ruxoxubibakizukosut.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/14535431804.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/51925301044.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fba6c532528dfcc22c5181a121191021/berepoperu.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_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 18800 bytes
SHA-256: 01339224067a05e867d006834a0fd50f11a84b0dbae00227e81ca86097779e5d
font_01_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 11076 bytes
SHA-256: 7d3481198d9b4de1be95a72f89f94fbb640cc2b95a31f9dcd297084443edc132
font_02_sfnt_off00014d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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