Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b2cc437fb08a52…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 23:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c74689f58cf6affc8978d0b0df9f8d1 SHA-1: eeefe0b79f9be4c4e3f0fdd806820db54ecbfbae SHA-256: 13b2cc437fb08a529d634d3d825329e8de7cc5a30cee96e79b9f27f52d62615b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://patanamachine.com/imgUpload/files/66745378601.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/17328311412.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/temaxidukivesarides.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/fawoliv.pdf
    • http://elitacasa.it/images/file/69018241415.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/1572253973.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1db8b595---faraxorugemudedigefajatal.pdf
    • http://www.miyadenthai.com/image/upload/File/39263905439.pdf
    • https://combrooncom.com/contents/files/16789371637.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/fefukepoxitexisix.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ag2et7fqjnulnpk9lt9gdugjpe/tojotasinolutu.pdf
    • http://sh-songshi.com/admin/upimg/file///68137091919.pdf
    • http://beming.com/ressource/site-image/files/xepapefotisawojof.pdf
    • https://basealimentare.it/webroot/files/fck_uploads/File/31591234813.pdf
    • http://phoiinnhiet.com/images/uploads/files/13878984300.pdf
    • http://k-souz.com/userfiles/file/wupulale.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139c30861c70---jixipitejowezuv.pdf
    • https://bizimpin.com/calisma2/files/uploads/meriruvuzikogisejevuwobe.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/40474548143.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/vidugupiwogujusituj.pdf
    • http://iphysiology.ru/upload/11331074680.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/im04pfo8pkajcp2cva32in5pi3/13596765465.pdf
    • http://titusauto.hu/kepek/file/73926052274.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fakp8uff4h9om42401obp108g3/77573921898.pdf
    • http://szwygs.com/upload/47224224639.pdf
    • http://radyoislam.com/resimler/files/58961939459.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=arkham+horror+card+game+3+players
    • 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_off0000c7ab.bin
9fe154ed94b8a149ab9b061612b44346884a2b0f324eb0a634288e8000679dd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 16456 bytes
font_01_sfnt_off0000f15c.bin
8b5247c79c7e29dde97f5612d0b239e8ab925ef70ed4f9a471a346a055f3467e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 11028 bytes
font_02_sfnt_off00010aea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 16792 bytes