Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d90bd52418843b9…

MALICIOUS

PDF

75.9 KB Created: 2021-06-28 01:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7750080cfe58e861733782c52a32b0b4 SHA-1: 062d6788f2095318428034927ccd8ad63ce75292 SHA-256: 7d90bd52418843b9cd10cfa98124c55df0682410927b39d797ebcbc97d951835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=fce+for+schools+practice+tests+answers PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4beef96cd6b9ebaedea5a1a67c5f1e42/72414149051.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/4hv376emf9ka8qnlgspp4f9afm/vitadezijorisanuxifamu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4b2c013764f50975d7721e6f593e7815/78060202070.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/832246227d226feac633dbf07c08ff4a/pulomumazorepakenirom.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/3loiopljt7q20gmpeh78i0glgu/15398025912.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2aa1925939ac798bef8e04dc464c7ec0/sofuzawavubabatumageguv.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed763d569e---pedaviwasuwijejolebodoliz.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8rg08m3kgt8tui7iglaphoa3dd/88266675413.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/48923812622.pdfIn PDF document text
    • http://klpa.net/userData/board/file/xegoxabowuwugotesa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/devasixibojogo.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210618_8ADDBDE229CB8F10.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbd465d5b---gokebolusutilusoradol.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/zuzepuzil.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/rikurajudagugusalom.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wulimagunimilifizebu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219258badf---fitasipawi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/witiluzireki.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cea1850f6848e5f87ef8941620fe9222/tobava.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d1803d84465a51681c1dbd6e66030819/fudajoxedanomoxasoluvanuf.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/toroseku.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7108acbaf6198822d485dc8cc5e0f8d0/91978759957.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 16744 bytes
SHA-256: 41d7cfa40ca9dd0031558aa28a14c474d4179c52d94eca9ae57efe2f2f57c001
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10640 bytes
SHA-256: fef4677833813532ef5868d21f6b2928cdc7bf0b9f95a2d2b012088f6d7724ce

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