Malicious PDF — malware analysis report

Static analysis result for SHA-256 1306c556b66cd16f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 16:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4db95b2cf384472f24ca3bdb6e284095 SHA-1: 15d394e39fb10aa99887f67044e1fe4608bf24a4 SHA-256: 1306c556b66cd16fe205883c554274f5257933582f86ee5ba1f64c7b525a1a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains. The presence of multiple external URIs and link farm indicators suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gegeny.hu/uploads/file/zavapara.pdf In PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/64986558747.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7gf0qoqvq54equruus2uqq04t6/jimilirutugoxatikadud.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/65665332995.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b08ec1844---kapapewadux.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/36450404778.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/97302040332.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/22182730251.pdfIn PDF document text
    • http://jadeite.ru/images/file/55805120073.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/88055877090.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/dizemawazovegikaroxe.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/wabutikukodo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9spffkfg7q7i6u96eck61lkfef/9290585375.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/wiloxoputizimafaboziduro.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/misevudil.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/70275012241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=reiboot+for+android+pro+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB61 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 22592 bytes
SHA-256: 916af24775203db3ca56dbb686458c87d5f599997befa922ef859d808aa90d3c
font_03_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 10676 bytes
SHA-256: d9a5072c3498202edfe3f3382713a52266ce0b5a9f1cbd90ffac9bbf3e862cbf

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