Malicious PDF — malware analysis report

Static analysis result for SHA-256 160d5fcba1780335…

MALICIOUS

PDF

98.6 KB Created: 2021-09-06 19:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c21b6566be139a29ce422e834960894 SHA-1: 120cb95bc7f0c032eb14bc3982e8cc8817453163 SHA-256: 160d5fcba1780335d6f32163363826ad71724e6ef5a7d62715e728f62b58617f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://niezapominajkowo.eu/userfiles/file/bopexufa.pdf In PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/sibubunetenibigi.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/xefirozafizexivolotumi.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/97024211280.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/37264736900.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7c5d0ab0bb4782bd605a0d19dbc2bea8/46899719349.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8fa5c1b2---gojorubebifazem.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fagegalenewesolu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/01a2db45461563147f355d8dfb0b7a2f/42365444453.pdfIn PDF document text
    • http://polkovnik.su/upload/file/31760337362.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/94cf228f06646c9af4d17f39983a301d/50211983342.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc931f3b64---64205246418.pdfIn PDF document text
    • http://wjcopy.com/upload/files/8733922295.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/80012751206.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160de4508a3a34---pojixikekex.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9062f42e---xowasidudosave.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2c3b16df---zifaxopi.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/zakovukobujomamex.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/54541351225.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5372ed7a04---mugosobu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ceg2c0n285vgm78kjpu3jsk6l9/85510106482.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e628edd52---31719720429.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/45482388743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convertir+pdf+a+word+en+ligne+gratuitPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 10788 bytes
SHA-256: a982c6027d66d9c362118b3b9676b3ff79b3c5a7884fd2950af12e1f9fa38efe
font_01_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 19960 bytes
SHA-256: 3d4e606a70b78b6d97a186f33e5258c250066343b2c2ff698d9b67afc1285edd
font_02_sfnt_off000164f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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