Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146996de87864c8…

MALICIOUS

PDF

87.2 KB Created: 2021-08-10 13:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19adf6f367971e722f8d8e3070f56e70 SHA-1: 36226718089f384766fa828db771bf7ff89d53ec SHA-256: 4146996de87864c82f70148b9cd132b0860f3b00f110078d18afa0c8fced39b3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The presence of a callback lure heuristic suggests a phishing or tech-support scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=tamil+old+sad+songs+listen+online PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90869a1c43---dikuxobelamimaw.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/25275820610.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/36097391235.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bd27fa93ca6bf8d35dee404f633862bb/galitirofiwu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/46375898656.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/36509950094.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/54571844965.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8877744897.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606d97ef832e1---tokerel.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/adc5302adc129ccc79f1c50478bf4e5a/78576252595.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/80875227828.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a436e69186b---wevuwefevegegusobunikotan.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e3a76f52c2f5fd0c3204e5f241c96ac7/biveb.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65cdedea93---99284823301.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/wonatosew.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/seziloridoluvukiv.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/2111800210.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/nefelifokukonuxapen.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/328146eada8ddceb309b70c8003afb52/zedifur.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jumuvalazigobegol.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/91239899426.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b09083aab---tadozelogedo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53523629927.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/ginovizixunaj.pdfIn PDF document text
    • http://minipit.com/data/files/17402605334.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ok46iksllm0pq9v2rop863s1ng/torumiza.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pevejijaxi.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 10456 bytes
SHA-256: 54047b423b088e47f2d5f92df48933994c16742b7e1c7fe7cce4370ffdc8138d
font_02_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 17228 bytes
SHA-256: 97ac959bc3a0cfdb85b69f49d57b833639039250ace109e30cc46ffe383a3c93

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