Malicious PDF — malware analysis report

Static analysis result for SHA-256 124a35c5620d248f…

MALICIOUS

PDF

79.1 KB Created: 2021-05-27 16:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ef755f49da84c4a75956eae5e8b92ff SHA-1: 60d885bbbe958c31868c9b6142dc4f839da318e1 SHA-256: 124a35c5620d248f560fe6d4b54d6d82d6b60f323d9eaf7a330aa9f56ac5b91b
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mmszke.hu/files/file/99848951946.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3ef394cntr2sjb4j9pink3c1rb/gutolekopozibibebagaz.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3be58696---10176971710.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af347884134---jajeteronefamumigevepizoz.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b51151fa1e---27648851830.pdf
    • http://amon-syotengai.com/userfiles/file/65425976632.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dbd4b7d4e---58652554567.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e11c9faa7f8b7716d7b16a9f2243f182/70853221905.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2ed6ce362df59fae1aa86f1d95e72739/54726705878.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8201f3559688613150cd42368c9e322b/gujofodugedakevumex.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/de260be2cbd1e5b0568b599e3be9f834/62326116500.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078667cadaf7---43876640131.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb926ac456---84564959512.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/16ed5988c654d965ca85946101a5dd55/doperidijanamep.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1bddfe9f38dcdec8121a5d90a0cd3912/89028787139.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/13b6f65987e83b4bbd968c1e6f6ac841/nugulobatevavo.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4ooioht0fnj0fqg3pbvonm2ejg/46663966593.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173a6026a1---63861045736.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lnriqn52fhohm10fti6knhilvd/74312686422.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gali+gali+me+firta+hai+remix+mp3+song+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63e.bin
9680b37b155add7a12a533752f24e718b6ce6109fc4740c1f5292390fe0ac14a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 5596 bytes
font_01_sfnt_off0000f93a.bin
b80e24dd8449fddeccfdc337a948141d9178837a6f2b6c6141fe63844daf817c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 11596 bytes
font_02_sfnt_off00011f2a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 4324 bytes