Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8032a2ccfe83fc6…

MALICIOUS

PDF

79.7 KB Created: 2021-07-25 17:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07fc48ab327c10a7c140306c9df463c0 SHA-1: 57d8eb2860abe94eea683545d55d5d6a4a775433 SHA-256: a8032a2ccfe83fc63a13736afbf0ac365afc12b8fb7c47d7b67fa838dba14721
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c848a717d---10937272611.pdf
    • https://dakhoathienhoa.net/images/files/47363032916.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/62943e1ef81565e3317b2443d5895455/70649553590.pdf
    • https://ebooksweb.net/files/file/gipafewexosenuperup.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd41b16e5---35175733506.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607169e5bddcb---18781411871.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/tenusileputezoz.pdf
    • https://alatheir.com/atheirwsfiles/file/60146436715.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e4c17f7ca1b8a18cc9e6477b97faebff/kuluriwewapetotazoxizegu.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793be308613---29717444825.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8k6js8mc9br0n1nno3te84a9s6/dolevawitu.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/wemewewuputukax.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/71194930968.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a70af9b6---fijojobuvalifepomu.pdf
    • http://u15.ch/ckfinder/userfiles/files/59807697880.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6b6d6e547115f9968e40c3b9d029e185/59833519505.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a8b2747545a35e4a05319b3440e92975/mexujevetabagutadoviraba.pdf
    • https://mariellatriolo.it/public/file/92274659694.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a563e73a0c6---kudetelibisabag.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/230d46429402d052fb270fa3b2014cce/27011374978.pdf
    • http://eaas-journal.org/survey/userfiles/files/rivoruxegezulida.pdf
    • http://ankurgroups.com/userfiles/file/62093575398.pdf
    • http://goref.ru/files/file/rugovudapajutiva.pdf
    • https://bdaudit.ro/userfiles/file/xekuloz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tablas+de+razones+trigonometricas+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_off0000d485.bin
dc993a5b6ac89dccea879aba06235a3a615893d03157756d12d6a9f3f68670a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 11128 bytes
font_01_sfnt_off0000ee19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
font_02_sfnt_off0001062b.bin
5a51501ab3852a70f9ce03a7c69745f35f1d4343c7c59a989df77f32e910efa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16052 bytes