Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5421ee31bc2e2…

MALICIOUS

PDF

85.2 KB Created: 2021-07-02 17:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d2fba9232dd0d15be3ff81ff5f7cb97d SHA-1: 2235da4f1d7361d5a59e7511cbb5d866f07eb39f SHA-256: 26d5421ee31bc2e26e375452967b12b190e2ed23a9ea70f1c8e458739ffac267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/16712758352.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/99797739002.pdfIn PDF document text
    • http://sun-tes.ru/files/file/4681259491.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f74d8dd1e---lororirolopunomof.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b42ce613---21950298901.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/bemenifurolorepu.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/49078862915.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1838aa4601cf99b00026500c6a9dc033/fizowof.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/248d80073c5ccbe092b0fcde44c597dc/82869576351.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848eee9c95c---pegifamazozi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e9447f295a70f48b91db24b4badfee7e/dogesone.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6kecng4suqmqdhbcjvmb9dp64/50595949457.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/90567264472.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/95562009768.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4247de7---73733403869.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210531030012.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/44526216436.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/91687407795.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aaa35ff3e7f0a3e305f234782189819a/61018080996.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b9aba402894faa915d9a8ebc39d47344/89203604082.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/31980814341.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607402b94fde3---futorujodokubireluvamum.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5823c0cbd25fccce2b0aead8d520596a/tulijubipunepapinoza.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/tadidagemalun.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h81kdnu9med1c3avnbeitq3cjs/bisomurafeji.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/28bb0005ad9be9059cc2a312415c4542/monifogibibuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+star+coins+codes+2020PDF link annotation
    • 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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10536 bytes
SHA-256: 9232981cb295a1d2f1db46e8dbdf05cfbb41f113bd4e002e4acc3ebac04117ae
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 17084 bytes
SHA-256: 66b3d13d298108ccf2a9276c3233a0c2b538378a6d4dd13f9438b4ce6aeb9090
font_02_sfnt_off00012fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1