Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ad1dccdded5008…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 09:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea12b8abeb8f70f734a3c3f3d15d2c32 SHA-1: 0aad4c431b92a71f83cd387810014f7b3dbd5b82 SHA-256: c0ad1dccdded5008717254e944d9571a673d1d95ba8b9c5c51455dfac9b36c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=free+download+whatsapp+video+call+for+android PDF link annotation
    • http://taikenplan.jp/ckfinder/userfiles/files/biterowusivivomilojobade.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/4326004711.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/24943025433.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/fulupujavanupezusewili.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/33124230210.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/rexanin.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f05715963a12976e62aeab9b8d4a4f9/70753910703.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/46411231387.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/64688646362.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/muxuwanuna.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/97115339645.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/tuzajamafefes.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/60db01e99540e0ff27fdbc289508551c/45180172269.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439c1117651---kuwatukamifumilexosolino.pdfIn PDF document text
    • http://ranch.pl/files/file/sifuxe.pdfIn PDF document text
    • http://pasaru.com/upload/files/tajamixiter.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/85903587509.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/dodegalamuperaluwodegozun.pdfIn PDF document text
    • http://scsytech.com/upload/files/kodotobulig.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/69248406089.pdfIn PDF document text
    • http://flexa.cz/docs/file/zirodolazurotusumu.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/98390960109.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/raserodububa.pdfIn PDF document text
    • http://adveotec.com/img/file/80074726672.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/55163987020.pdfIn PDF document text
    • http://gr-chem.com/upload/files/jivabokoxisa.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/7180523337.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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 10844 bytes
SHA-256: a5e3c6b00594e58391aac2c693973f80d2fa64fefef4ad1fcc25725ae4a9771e
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 16668 bytes
SHA-256: 42ed2eedf781b2372dbf747fe87b84311aefe15d8d57587cf8a2544f71822048

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