Malicious PDF — malware analysis report

Static analysis result for SHA-256 035cb6e66d31e2c6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 09:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e983831eba2879eb01ae04b147cdadac SHA-1: 0df30bb26409b07999235fee154e1667142d1fc0 SHA-256: 035cb6e66d31e2c661202fb495da2ef9aa3d110e525ba4d5a3e0287191db9177
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious with high confidence. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=cartoon+craft+apk PDF link annotation
    • http://zbraneklapka.cz/ckfinder/userfiles/files/36673523681.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/merazekidiwulisegugidarul.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130278ab2505---parukazuzetates.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/22398882905.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141ccb0613cd---nifunezosirudezadewi.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/71266234283.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109130711347314.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c96956ec0---kolajimomelugisenimojusa.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/97828590299.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/32760994515.pdfIn PDF document text
    • http://eva.am/files/ccd17478dfe64d29.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/36304019876.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/03191cd2de2b76e2f8876ab8b390f1c2/64213553084.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93125f001---penefesuk.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/38293288744.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/9329275393.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/fojapijesipopovusimuguma.pdfIn PDF document text
    • https://themalc.org/files/file/karibuwojitudaregi.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/duxopakaparojoripozizisot.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/vuragidewipavuparuduluzov.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/48493309812.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/65405982680.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/tuduwexejavodabezikepo.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210904_CF96D13935B042BD.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/84907972667.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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 10160 bytes
SHA-256: ba37c3e1b2cd6d149ea7ec4b5dfa37da00fea3584fab18eadf19c3ad009df973
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 20888 bytes
SHA-256: e7532724ee5e901887112f629aedd6d73599a26dd2c05626f4706489dd27792d
font_02_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1