Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4a8a5088fcedcf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 15:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4a369f0a4689a3af48c65a8ed1f3072 SHA-1: f92bc2dce9a06b330d57ef6f72413007807a26bc SHA-256: bb4a8a5088fcedcf73b83dcdaf18bbd18d96c703d83e2dc27560f3d475735f28
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories, indicating a link farm designed to host and distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=sony+rx100+mark+iii+manual PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb32a4656---balemenatijejufexefi.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/95351552230.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16126f9cf62504---mamekivowukuxemiw.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/kelurafurujikil.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/zesexotime.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee103956baf---86507915411.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lekoriloxefenotukogasagi.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/kobitipoladefifisiwakoxu.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/dijimolaxevopipew.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nediwale.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8ae4c5cd2c66d86ae6600f22037dc169/mojaxodagod.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/33526608784.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f72114f3e---zunupuk.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/sojilaw.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/68646349149.pdfIn PDF document text
    • https://dm288.rs/slicice/file/24618812233.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0fb1119be1da67193b24cc21f101f81c/guzuzimudunopage.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf21d3110---67236462429.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d867de177b---pexasoxa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b4b2f21d38a2b5db9c3b8ec644700cba/99373950642.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d8c6c5f52257b16a2333cdeee02e7219/jadiliduboninuzuvizopud.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/xepivuvulobagibuvodub.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jasuj.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/zexumewipavuf.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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 17920 bytes
SHA-256: dd6e6075095346ca1f04cae1ba10e42182c75428409687d7571dd69b4a178125
font_01_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 10528 bytes
SHA-256: 577aab5fdb1b60b8f5187ce4050084657535148ae4e7e770919060e6f565d65b
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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