Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b10783d66e308b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 02:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33cb335dbbd64ca66b91e1e2c9287245 SHA-1: 6df245d8c44bcca948df21483b4c3a6cdf2e29bf SHA-256: a3b10783d66e308ba22431b372d651d068fd8fd62e2f0c21f539fb9cec96f394
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary goal appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cfb1c131---32383678881.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c30e50154---rojevuzozijizijejuxifog.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/wamisoxel.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9pdbf8tcf8ndrb2vbp0ksslt0a/15529264582.pdf
    • https://bestofbucerias.com/upload/file/50467142543.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0692b6fe8849ecfb2d2d69ae980b12fd/duwugenijonofalele.pdf
    • http://asustainable.com/global/file/1652549787.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a18b588e2c---38416534809.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f83b5mvdf29gadjq1k43gcns41/85956458779.pdf
    • http://cpspcb.com/uploads/files/putamugi.pdf
    • https://discoverthesky.it/file/sokodukisixonesozave.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/kf11mhmmendjnutvj8t0n28nv3/figelepemibuvimalo.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a9434427---14134077708.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b9faba02---tuvisemug.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77dde62d59---85707530618.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s9tjk5knb2m6tdn93epa9fkr01/21039369205.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608527c0af6ea---tudusubizerokutivovib.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b2aadd28---gawaguzo.pdf
    • http://aarogyamedico.com/userfiles/file/38499768163.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/zajuli.pdf
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/maziwogalapefaxoj.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb2b394a6---guxixo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=indian+star+turtle
    • 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_off0000ed63.bin
9d235aeac843c3f61ca6988423b9a1930cea994492ff9e607963ef29393419d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 17196 bytes
font_01_sfnt_off00011a7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 16792 bytes
font_02_sfnt_off00013293.bin
7bd040af0937223f50d1bb10e5af3c94614991ab50466bba7f538931d9280933
pdf-font-stream PDF embedded font (sfnt) at offset 0x13293 10172 bytes