Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1be53a0b9efe3d…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 05:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0d8eef299805696618e439c5c0a0096 SHA-1: 9a0f00115cdb2fdcd279ad2964204ddefad36de2 SHA-256: da1be53a0b9efe3dbaa35ca05177e84ea51b8d14b329ff7f0f6db3baf5d95427
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as a phishing trojan, and the ML classifier strongly agreed. The presence of multiple compromised CMS upload links indicates a pattern of using vulnerable web infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd009a6cbc---vaparofaz.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e5a448c9---jovodimobemoramezekuvoxu.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/psuvik78qmkv14m2m9vbumn8hc/94166798601.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce8a59767---sosonofoxewuf.pdf
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/63160924230.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d0cd74bdc885a93ab003f2f22264791f/wiganezigu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/71fhhp09vqdv7m9ea35lq0ogie/72278605628.pdf
    • http://mientaytourist.com/uploads/files/jivigutufugubir.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b042ba3bf23---45533606161.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090047504dae---lunezejimetevitujomujog.pdf
    • http://www.bluewhaleline.com/image/upload/File/76004657471.pdf
    • https://cardion.dk/gfx/fckimages/file/58684532354.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/mamarola.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/av0rudb11udi9v73b6o8r3had1/viganedirumenafavesuwup.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d236542231---11814299595.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160716eb7b10de---jomapokanukurewimado.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/5uolij0gi880i51v818rah2n5i/14454924699.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945610ee3a---40456449329.pdf
    • http://sarljarry.fr/userfiles/file/zesubekorogukud.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/l57jjfph2ac7j4t4l2pnan1at2/gurikani.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a404e0eda0b---90555361634.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/2b067d445fd3b7d7de442afce6328f5b/45875786757.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/m1onf4966058n80fghgtrk2tes/gorowotitego.pdf
    • http://vswet.ru/f/62108488402.pdf
    • http://alexlunacoach.com/img/editor/file/nirofowatatiga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=white+bump+on+your+eyelid
    • 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_off0000f634.bin
3ec486cb7ed4d1ddc0b9eeb92558f80bc821b2314a5a702668c56854d83a6526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16992 bytes
font_01_sfnt_off0001227b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 16792 bytes
font_02_sfnt_off00013a92.bin
da1a23dbd6db89818bf8c97516c3d7599dde21e235cb10ea1f4b47d544dbd175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A92 10672 bytes

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