Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2640e25c19eb37…

MALICIOUS

PDF

82.7 KB Created: 2021-07-20 01:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b1459e6f90349c7ceffbddfae356c8a SHA-1: 5170330d81fe1384a4c1f4a25015323fc7516381 SHA-256: ac2640e25c19eb3723502d507798f90473bcfcdac74800b6f7b3a10423df6a45
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 classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content or phishing pages. The document body is unreadable, but the heuristics strongly indicate a link farm used for malicious redirection.

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 http://transcash.com/ci/userfiles/files/76310981161.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4a5d9a2d22e10b081f597e0a2a8d1584/27811712663.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3e18eba22d0a296793303ab57bbf2eed/jaxozorudodenupadorade.pdf
    • http://www.alfapilates.pl/upload/file/punilisafarajabu.pdf
    • http://newgrids.com/userfiles/file/gewawujubisesozosapizob.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c879e34c614---1450629880.pdf
    • http://ahlhy.com/uploads/file/161438247541.pdf
    • https://hoakhanh.vn/uploads/image/files/jozipotipukulow.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k23ic97pdidj45nd9ojipjlhb3/70404863224.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/35915336198.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a312f2585---9370924302.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/34e7b2b8d2190532ed8a1c6f175a461d/depudimimuxezuga.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/523346cc4ba025609ec735c5939e962e/loxerixewunigol.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac999656a07---zuzoxuzilalironitokuda.pdf
    • http://fittbike.hu/files/file/13050682871.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b3463042---56581774954.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dea19a66f---duvinasovelatolojekozojek.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5f8bcc3c7---rubagobipomugo.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a604e522a69---busufamujugarob.pdf
    • http://jarosi.hu/files/file/kifakupexetisowisegun.pdf
    • https://avgdesign.com/userfiles/file/ruguwujuxibagejiju.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abce789fc---45385039672.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=real+life+application+of+exponential+function
    • 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_off0000dff7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 16792 bytes
font_01_sfnt_off0000f809.bin
03900cef232efcaf152e37065780cfee952601917eced544274e7692e2a2a187
pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16924 bytes
font_02_sfnt_off00012411.bin
b5e7ee7da27ef72144f5b032a1ae1e5c50ab2115ad10dacbe53199bc896790e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 10452 bytes