Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1e4a8953ab7a29…

MALICIOUS

PDF

89.8 KB Created: 2021-07-06 20:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 384802e9b0e04b0c53da580b9d79b9e1 SHA-1: c81699855f7411665dcb715ba8ad8e647649232b SHA-256: cc1e4a8953ab7a29e9da2cc14c6e6acec07d7f827478c98536e8f6beb7940a9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://archism.ru/uplcv?utm_term=how+to+get+rich+fast+in+bitlife
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7f8c417b---furamanemab.pdf
    • https://unibel.pl/pliki/upload/file/62329670603.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tnotb9u2cikt1levdk7ol0infu/fajekekelazojijilodi.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd4520560---70949366878.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7b765c1659f51ee7af0b557903833c8f/terutazoxabebanatadisogax.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e2902ef774747134e9b046b2fac0ce4/gutejut.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5face5f7ce193839166ee9a614162008/kizujexixonus.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b67df4aa---15695037398.pdf
    • http://zeroseistudio.eu/userfiles/files/wewun.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/werefibokikatasumopuda.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076527934e2b---11797840898.pdf
    • http://beergolfers.com./blog/images/file/9460417820.pdf
    • https://lingchuanfloor.com/app/webroot/userfiles/files/20880422291.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/e2qh8c10v3hhj72gfvemg5thja/95887441577.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dde5482f---24274582039.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edscumer0n0djls8obnj8g5o44/kedipozujawelonitixukibot.pdf
    • https://soft-print.pl/app/webroot/media/files/gukivivuvubupaner.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/direvuxemenazesot.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4aa8802c9effa6a0acc1c91c4b7bdaf8/40770371329.pdf
    • http://okwecare.com/usr/userfiles/files/72200714780.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ef22aa3068138370a239c02b7a5baa92/75874440286.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a8e01ae919fd20b09a8d959c32ad0069/pofepa.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6404b71f5---bozadu.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_off0000fc77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 16792 bytes
font_01_sfnt_off0001148e.bin
43c55a83240d4dcf5a8c9c6f8fb78f887946ec9a435d450b4fc7ee37ad89d3a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 10832 bytes
font_02_sfnt_off00012d83.bin
2caf4ffc139c724e610e9a83d5f3c74f8699ad35c124c3169c3b5300e16beb70
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 17076 bytes