Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cbcf812b42cccc…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 15:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67adbb8846ce4d1ba83e8640e3bc4f1d SHA-1: e815a8f85aa07a0fa3b596ef6526ea2fa624382d SHA-256: 34cbcf812b42ccccc8abfc820f0c1394e5daa2d07113e468c50cb9bcb5541f00
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=electrical+interview+questions+and+answers+for+experienced+candidates+pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c54970e484b---tituzigimebedir.pdf
    • http://andlupa.com/userfiles/file/4459114913.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a67a481e7e9b24fe54e20505cb764a82/70822189391.pdf
    • https://sokolzgierz.pl/web/uploads/files/puxemosagexututabexiwunud.pdf
    • https://kaptenhoki.com/contents//files/33092012696.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0e6ad69b45d2a6eeca8e14e1a737be87/batodobivepofazuluxebi.pdf
    • http://wsp.pl/userfiles/file/71787637351.pdf
    • http://baovethanglongmb.com/upload/files/7168561798.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4da3dadb9236954398644268a6182c8/69868453479.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/be244e29ce0351e522222acf5bb14c5b/77201537621.pdf
    • http://sunwisechem.com/Uploadfiles/files/delujepegexozuriborinigu.pdf
    • http://119pump.net/d/files/xivoxuzexona.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e68bd57e---13182946743.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kl62vk1595t0gkbklomfh69h11/vezubatalo.pdf
    • https://thietbivesinhanhhuy.com/asset/files/48235512203.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/64e0pq9u2lnr8vgq8cugpntek0/47948262051.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8a74dfe935c5dfe221551fd2957f680d/debutakabarevixadava.pdf
    • http://haniltm.kr/upfiles/editor/files/5244426693.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6pdkmg4n5ebafh045541slfiv6/tagiga.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c90dd746b4c---bozuxazivezujodexuwagov.pdf
    • https://autoteam.in/ckfinder/userfiles/files/maximewusejexukoj.pdf
    • http://scpt.it/userfiles/files/temufenijizodebodix.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/fogatixajuxanukorotil.pdf
    • http://asokmontridental.com/userfiles/file/46054649231.pdf
    • http://royalwedding.jp/images/blog//file/24912975212.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_off0000de07.bin
ca0ebd0f90af937084c31c51d8cd917e082da1d14c747a3edf8ab2247028b270
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 17452 bytes
font_01_sfnt_off00010b22.bin
29a84da02be06512d9841ed19c890dd49a9f187986133f7062ea83b992ffc187
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 11096 bytes
font_02_sfnt_off00012502.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 16792 bytes