Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e533137352d9c9…

MALICIOUS

PDF

89.3 KB Created: 2021-08-03 02:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb0b6d2d349029d001498c7daa4f6075 SHA-1: 7b45c34d9e1c47907014f55d2d445b40d2f3945b SHA-256: 09e533137352d9c996e690991d8ba6fe03d2cc45e332623dab4d7e4171be6fe3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://bhk-aindling.com/userfiles/files/tiwowogekina.pdf
    • https://giga-tronics.com/userfiles/files/47991441387.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/61e3236939de18bb2950b29e85c283b1/vanimulafasezunoboziku.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091898789084---zuzuropixemasazisen.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44d5c92e1---pekurokakesubane.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772db284ec0---5401463305.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/e2isaoder10t6tsoc9idifl2d9/mexuwuni.pdf
    • http://dienlanhtruongson.com/upload/files/gimenamiwalugulutepuneguv.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686b779dd---vosofuwunimaboto.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/763hcods0gnjn65601vikduruq/7892514828.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/rikazedimidojebide.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/n5cmleuc9spcj2fq7f8urc8elf/20509606171.pdf
    • http://animationcoach.com/userfiles/file/moroxikosetobesuniko.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9be93eda0---koxexuteroponuza.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1b7c55f6e7bac93f3e1857bc2fdd6976/73495759108.pdf
    • https://fcksa.com/ckfinder/userfiles/files/49861776883.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/suvamutujibizovutojoka.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a8b09f0e2f0c2b4adeee89ff2e130519/25560007917.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6778e2e6b---nalariridixunonu.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/bikujozenufunuboburo.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jirujemekutavi.pdf
    • https://uleshuzataruhaz.hu/files/file/70228612250.pdf
    • https://polandpools.com/contents//files/21635087645.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad0996f3e---lojeleliguguwetowunofolu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=1+to+10+writing+practice+sheet+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e5.bin
47748ea355de66117c8862982adff7350908253fa3d24737774123ce7deaa559
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 16756 bytes
font_01_sfnt_off00012495.bin
f533e3c623b3d112631f682a7ad503a71da0ebdf0e76c16f70a922ec2581dc1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 11016 bytes
font_02_sfnt_off00013e06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E06 16792 bytes