Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d55ab7b130db293…

MALICIOUS

PDF

76.3 KB Created: 2021-08-01 06:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ceb1d54b893b976efdb484cf35e22c0 SHA-1: 284707c0803dd09ff071fd100754145e8abaa6d8 SHA-256: 7d55ab7b130db29382ca3ef7fb556802a010df7f027b9c70e3d6ee449fd46cb1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs and heuristics related to link farms on compromised or disposable hosting suggest the primary goal is to redirect users to external malicious sites. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=does+best+buy+install+tv%27s
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1e2f7e3df70652f8ec56c80e319a3940/xajutupepumolu.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fa64337c9---33329049674.pdf
    • http://atek-ent.com/upload/file/17405977072.pdf
    • http://stphilomenaonline.org/userfiles/file/fazegivojewok.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e8836e59c93---nasikijororejedezar.pdf
    • https://takipcisec.com/calisma2/files/uploads/luxewojifa.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/27102859384.pdf
    • https://mayurherbal.com/userfiles/file/serupelojimanal.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b2f632b9a---dodikidemusumawumululel.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/91952854901.pdf
    • https://lawina-radom.pl/files/file/wusezabomewi.pdf
    • http://madmojo.com/fckupload/file/mofen.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fa63ff75eccc05fa7ee95f28861cf6dd/xinonokanetogivikojixoke.pdf
    • http://beijinghuojia.cn/userfiles/file/megoverepepevax.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819807f75b---finolilojowu.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c005ca26aab737ec20dcbd4007b8a49e/salugenate.pdf
    • http://crabandclaw.com/uploads/files/fubenukowotopemarugopo.pdf
    • https://iuoshili.com/upload/users/files/10637568873.pdf
    • https://seitonsolutions.com/ci/files/jabujubovewigexuriji.pdf
    • http://gdlianyu.com/uploadfiles/file/zetalutaripiruwularire.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/15499609330.pdf
    • http://wwpokebar.com/uploads/files/luwib.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823dbb3611f---kowigovuditifawanot.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb380349648---27375242704.pdf
    • 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_off0000ca6d.bin
6860f742181b0af88e534f184e9f2f7fad7ad2c16234c1a1c3e5142c082b45a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 15788 bytes
font_01_sfnt_off0000f2d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 16792 bytes
font_02_sfnt_off00010aef.bin
8516cf51f417f91b7af145a9c057d4d42d695e71a1b1e9460e49c60029ed2bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 10456 bytes