Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bec6921c6831d1c…

MALICIOUS

PDF

173.5 KB Created: 2021-08-04 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4739220f9da5dfcda125de730569e1c2 SHA-1: 299075a38ce5939d91a69b58fa81ea13bde17f58 SHA-256: 4bec6921c6831d1c80ab7fc5416c78e4edae9fdb15fc146b840fdc72adff7d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://huntic.ru/uplcv?utm_term=bonding+broken+cast+aluminum PDF link annotation
    • http://vienhung.com/webroot/img/files/sixepegawotu.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/wuxegumolapowolixijot.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/8244977498.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/adc82c73499f75a0c70964a39ea71466/74359993882.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/61166795971.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/18255271913.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501164638208300676.pdfIn PDF document text
    • http://sns.hu/_user/file/11442337189.pdfIn PDF document text
    • https://hoalavender.net/upload/files/bifikemagegok.pdfIn PDF document text
    • http://ipllaser.in/uploads/dovuxuzozulazumofulod.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeb326c86a---semed.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/suforina.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d876fa0f31---nogulenajupexozaluvodene.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/demenarinofexul.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/af9162c5a6c15dfec475d5112037ab62/30419026480.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/59764532509.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/labonijemanukegeb.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sefadikegetuwigabatebele.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b61a1805200d4d786901631934b42575/31139000471.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/34749f347e8902f84c25810fb9d781ea/nuwavunabedusigitupofo.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/godaf.pdfIn PDF document text
    • http://adveotec.com/img/file/jozowizatuzinobevew.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5556ce9717e7165c970bfa989815940f/11447241390.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/titipexabufazerolegi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/umovidubanamevamed.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_off0002383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2383C 23612 bytes
SHA-256: 7ec965e7ee4ccbd5f05497971b801c7a180e580c9b2ba6f50688db42e5d26cc7
font_01_sfnt_off0002750f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2750F 11096 bytes
SHA-256: c1732c682db52cec54025503b42f75230478e230b29a9a47b51fff38073ca46d
font_02_sfnt_off00028ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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