Malicious PDF — malware analysis report

Static analysis result for SHA-256 034b47b4351a8bc4…

MALICIOUS

PDF

85.5 KB Created: 2021-07-29 17:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80073efa897931b3c5f218651f102525 SHA-1: 18a54f5b5cd34b05fd29b15e1d40ca5eee03a893 SHA-256: 034b47b4351a8bc460eb891c46ecbc90bbaeaa9f438733d549a0fef85856c1a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of link farms on potentially compromised CMS uploads suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/begasabote.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2719ea68e2---jasejanawev.pdf
    • https://lose-weight.tw/upload/files/suterezofo.pdf
    • http://tafgambiatours.com/userfiles/file/judutifutalose.pdf
    • http://v-lukomorie.com/uploader/files/zezifusazelanovufibupa.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8682860a51---sopitavepatifijejir.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ff354ddefff08dddb92771dffc4c5ac8/98087362073.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d91d3688720---bemaxulevogeran.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c7fa70899d72949e79bb1a315987fc6a/fadebumaboxepaj.pdf
    • http://chiari-web.com/ckfinder/optimist/files/lesabebij.pdf
    • http://atthaya.com/file_media/file_image/file/vaxufidosatuligimaw.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/21ec0701f6f2bdc144b01333589126b3/66539261907.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b9d92c04f---kafubuzogajaxobif.pdf
    • http://hakanhurdacilik.com/userfiles/file/kedikulokupezegax.pdf
    • http://lucann.com/Upload/file/rasuzo.pdf
    • http://caigeshi.com/uploadfile/file/2021061701091273499.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4dpi4hl62isbvq6d7do7pmuido/94737961524.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608497d1ae645---81740545008.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34e3141e953f4d82aa6cc4ff76bb3430/luromeropaxalevubavopaj.pdf
    • http://gallery4walls.com/upload/editer/file/depunape.pdf
    • http://gaziemirkentkonseyi.com/upload/files/wubiferivofexiperelole.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=por+donde+viaja+la+informacion+por+la+placa+base+crucigrama
    • 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_off0000e272.bin
32be55a194a5e8e963323c82d3e4a58dc9a5573cd585f062ff4babc442010bd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 11300 bytes
font_01_sfnt_off0000fc80.bin
ec1b93d7ee8d24a01ef161e2294506f924e571561b97d313658d692f350850ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 18576 bytes
font_02_sfnt_off00012c96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 16792 bytes