Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67f21f829f10ab1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 02:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a241f4214907e40332cc013bb77d83ec SHA-1: b182893f9bd89c0180049ff3d67605d55e92d070 SHA-256: f67f21f829f10ab1401b0eedb9a8e5b05f8072b59f1eef951afc32616f665f1c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites.

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://thefertilizerequipment.com/d/files/zelegepuwulewowej.pdf In PDF document text
    • https://siliconautomation.com/userfiles/file/86311113066.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/motopatunizema.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/13076065444.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nipesevu.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/81561121996.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/galiferiviretutisikalevuw.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/39095016430.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/nikomuvukesite.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/51075573117.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a1c8c1ab---kebodefezojubinubumiwe.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/derika.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b35504c3---pipawuzojoxazomizamodad.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/88265579183.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/vibinutitipowifupivim.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/jabifajozud.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/6014037994.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/755856114.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/27394346031.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613678c500f41---wikikajenerigomaju.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/18311371566.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/35333237618.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b562be775f858639245610dd86816532/wexujabeseze.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/mevokumonavibid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=photo+editing+app+apkPDF link annotation
    • 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_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 10452 bytes
SHA-256: be04d1f0c236ac8f15c2c70660db59bb2e0c48fabbeded23f59c9e1f916b8aa8
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 16968 bytes
SHA-256: 81f59cbc3df9028a03610738c78a9c10cc0a4675538444b05d63d49daa77f5ec

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