Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14436066179759c…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 08:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82324ccc8bfee98cfede273b57c63790 SHA-1: 8ca3d764e051ab2d44497b7ce5224494b48185f0 SHA-256: d14436066179759c0bf42395d7b74371faa175580a09f9e9a0ad4545515a6e88
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 upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d48902712ac---nujosofugesimeva.pdf In PDF document text
    • https://airshow-bg.com/file/pemesiwiva.pdfIn PDF document text
    • http://hrudolf.com/userfiles/limurokuzejasobivexumufa.pdfIn PDF document text
    • http://inistor.com/ufiles/files/50551270740.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/29407635621.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/pejarejevefowipit.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nbfjit9dvg1ub8ft4vt32orkv/52473026228.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/19960340694.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160983f1149e1d---dotumabitigepifitorel.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ad1663fa0fb6e49ba4957ab38e1c0a74/22343462983.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/zigaxo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975c9edffa8---52516426997.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/47239541370.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c4a8c0e1b---vodiwizabibusubovusajakog.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/0q9u0i5ahopfe7cnf7h33fk7e6/jigexijedobiwasedavomose.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/renejudifedik.pdfIn PDF document text
    • http://turnyras.lt/Files/file/66672105738.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fstmgafgc1rh67hud1n40icgtt/99470978462.pdfIn PDF document text
    • http://amandamaitland.com/images/file/bubonixofazemuviv.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/71dc8f5116e75930eef9305c5e36363a/pizoviwi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9cb003ca9---75864827627.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/tobime.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9e891682---38753077266.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/rafiroborevojesusegune.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/36b2d2e6c90ab9a86ce13ef7adf2a05f/dalawinupevi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/m0hldhoedomai78vmcqt37q7tk/80409940239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+number+of+two+digit+number+which+are+divisible+by+3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 17428 bytes
SHA-256: 157b085cd717000d6344c4621ce0e0d66102892fc65320d776bb592b4ba03568
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 11564 bytes
SHA-256: d3c4cdc831f54879e06552f4c9b6e125aa36491cf4bd5175acb72498d0223367
font_03_sfnt_off00013399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13399 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9