Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfe3a9b0a746d0d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99c73b39ee4c6c719bd0d469c4770509 SHA-1: 8bafb0f1100eb98770d9d674a42ad6746c690e3a SHA-256: acfe3a9b0a746d0d0a0c8cfcc1ea7d101c6a0091b2192e019e5416d2face90d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and disposable domains, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fe81225cfccfe11850d47355e7a1d218/xeriloniveriligijojutovud.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0b557d1a373d58a53de45912e3889101/15369242845.pdf
    • http://omni-links.com/images/blog//file/84569314441.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515034843852175.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ri6pvi7f775fsbufnfumabsrf6/54474443462.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/edd250333f7d52b0d998d18e3565098a/6093856669.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609be657b300b---vixibibonopof.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0ebr85h5n4d9dpupur3b8b8a84/nojelunibukasuva.pdf
    • http://sola-brothers.com/userfiles/file/dorubatid.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a130845e999---labaxuxoki.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/af4cac36d30f2ae949aa60eb9c709b88/52776285309.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2a4cc042---64320130751.pdf
    • https://zionapostolicministries.org/uploads/file/muzefakikedewiniwip.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b95929jk4dafc5viocge9cub82/36021243350.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727d532541---miwebudizifosaripoveriwes.pdf
    • https://obermeyer-modemarkt.de/upload/file/6648331223.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9edb4bfdc2553dad29ab935f8c104bdb/lovobenutab.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/835b87fc0a14ad873b20968be9ead242/nukudiwijiduk.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089b85ec9dab---75510112703.pdf
    • http://northcity.rs/slike/files/48145718144.pdf
    • http://lubrifianti-auto.ro/files/file/45670491420.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=competitive+questions+and+answers
    • 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_off0000ef67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 16792 bytes
font_01_sfnt_off0001077e.bin
7cb3e906bed01b792748b4afb476b6f2a9dd452538a954bc738fc89b1e97dd12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 10936 bytes
font_02_sfnt_off000120b4.bin
93db9e0e8fc76eac687268d2c4111df926c32e452a3541255b0121592b0e99bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 17652 bytes