Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12fe800262b96aa…

MALICIOUS

PDF

135.3 KB Created: 2021-09-02 15:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3c7a880fe566428f88fcc2f320a4813c SHA-1: ac4a97fdc5db1cbb23f631fe4bf424ab457a17f7 SHA-256: c12fe800262b96aa3be555f5b97f0413b19d37a4a0a9a6cab28e70c7f7a00dbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to facilitate access to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=braun+perfusor+secura+ft+manual PDF link annotation
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/68277860261.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/xinafabem.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/porunegigufe.pdfIn PDF document text
    • http://parilka.by/var/upload/file/89712795739.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be079eee4d---gorovifikade.pdfIn PDF document text
    • http://web68s.com/upload/files/91783552066.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2d598b1682c9304bc258eebea79b6d78/54090418652.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/rijeriledudazaxotaviv.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/34797003612.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e3373874---xofumuzokijiwedogi.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/9641360460.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1crfk4oh5bnhjh27c8slltl714/76456374676.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jq35p8advenn1t4sj2j9od8bug/tozodusutevana.pdfIn PDF document text
    • https://equinox-e.com/upload/files/11899281899.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a198cdd39e5---5219485495.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080121044390.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c9984ae04ece9c08acb1d16aa3b726f6/tabud.pdfIn PDF document text
    • http://dnepropress.net/files/file/11637197874.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/367eeef003f021fb09601abdf3505816/19486898984.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2be7250b9a370464bbd80122f0b711c7/29553300910.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gijevosovekajevusuparow.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zasinenigakexavewewa.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_off0001aaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAF3 20244 bytes
SHA-256: 1203822ebf2f77f1339405e6a367669e1ad6ab3c903f01302af09d0920802839
font_01_sfnt_off0001ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6EC 10704 bytes
SHA-256: 18633f99dd58b70cde8baf749aa27489321494eeeca082f958261fc4679387bd

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