Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a2ec1e8093f199…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 21:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: debf3b45b5d3566a1c63c2b441207be1 SHA-1: 72f72993a51db7173402f3777a9f2cfdccdb67c9 SHA-256: 16a2ec1e8093f19951f9d6271c16872fd17bc1e1c18bc0105007a940854b3c57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D8%AA%D9%86%D9%85%D9%8A%D8%A9+%D8%A7%D9%84%D8%A8%D8%B4%D8%B1%D9%8A%D8%A9+pdf PDF link annotation
    • https://pernambucoimortal.com/imagens/files/83211269968.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/fufefifosopa.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/25711504842.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gejebusawuvagozerexoni.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816788f1003---jizimujevefejefibureme.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/9042787263.pdfIn PDF document text
    • http://dzbnf.com/upload/file///nadidutamew.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/wekujawamuzon.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/jepepoz.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/46290372346.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161311f267f001---wigalut.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/fulesikigezodaziv.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c4kvinqdqlopso0dbs0tn15mk2/doxilawamirajeparufav.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/0h2274lh9ddc2gj3ad4df5cqsq/kisominokufejafifar.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/kigobu.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/fotinaxopiti.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zotutasuwusadibaripavak.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094976abc1f9---24116975369.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eb62ab6e97f845886c3d50499c237167/xogaxo.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/gozavupozax.pdfIn PDF document text
    • https://digireg.cz/upload/10922331596.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1fe214ed---32716617330.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e648e5342ec---6727210621.pdfIn PDF document text
    • https://advik.net/userfiles/file/linejatopitapu.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012697.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12697 24224 bytes
SHA-256: 4e3832106ad7bbd8aa1389bd535841dca56e5eff7811bee44263b0bc43c2416e
font_00_sfnt_off0000c070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC070 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_01_sfnt_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 20236 bytes
SHA-256: 6529022f485ee00f1bd39d897d1130fed94f58494d590fb69feaec3b67b7853d
font_02_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 18572 bytes
SHA-256: 2a79997ebcf265d4705c9fff7306ce88c17402697571e7b05dc231a812c7a9df

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