Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab7da8756721e33…

MALICIOUS

PDF

97.1 KB Created: 2021-06-30 11:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8953ab4871a794a435b9b959042fbdd SHA-1: 7e83ba1aeb21eaaf9f35990267a0a98872c86110 SHA-256: 5ab7da8756721e331df1186297cb1f9b30bc3dd5f9fbe3c8680d534f488887db
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains. This pattern is commonly used to distribute phishing lures or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://nakajima-ya.com/upload/save_image/files/fupisoxuxun.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/wovos.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/45014523151.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77dfa6914b---bumibexumoleg.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e308907b---govej.pdf
    • https://noithatkuongthinh.com/uploads/files/20082444605.pdf
    • http://muzeumostrowiec.pl/obrazy/file/71920143784.pdf
    • http://trendymamy.pl/userfiles/file/96984200738.pdf
    • https://medius.sk/userfiles/file/40128251376.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db55afe8638---sinofodakamijaxisudepozoz.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/008a6b7386e3d2427c5a07e4b2c92073/1811661999.pdf
    • http://alexlunacoach.com/img/editor/file/71469739236.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6v1or92mrtuqs1kjab3kqiee33/pimusivej.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/porevukori.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/p3pv4cmhhlg2idgasqm735msqu/kososotebet.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4d22e03f8068f98d0e48f99484482170/1520516870.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b98d1ba53---67312125428.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/lazeliziz.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fee75eb04630633a5c77cf469cccccbc/44719090483.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/dufofituri.pdf
    • https://equinox-e.com/upload/files/bilavatinixekovopimiwor.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8243f3305---65290276997.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae001c50ff---xuzupavubupebez.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c06583032c6---sedurofoxevuzok.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d9c3d802ded07d32ffd9f40e3a3ca06b/36572598391.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087bab252f84---56473026447.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=semblance+of+truth
    • 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_off000118fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 16792 bytes
font_01_sfnt_off0001310e.bin
1b08a4bcb58896e504a05dbb3e6fe3afaa8dde9b5dd5d133713cd0b58a3655db
pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 17580 bytes
font_02_sfnt_off00015f01.bin
11212c113e51ad1725abba2ba322fcd315cda75d1473a3b360daff5b18ecfe77
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F01 10656 bytes