Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8825e3346b51c2…

MALICIOUS

PDF

84.4 KB Created: 2021-06-25 17:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2e9c834f26350ad7e74af192ab2d7ee SHA-1: b51f0c7688a20e775a0a7c167318b012e5976b9a SHA-256: 8a8825e3346b51c2a77346e5240f3219f97445f4b4a34e43c3a24347013fac38
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nikosdimos.gr/userfiles/file/69321082557.pdf
    • https://cochleartudaskozpont.hu/files/dijavagemufaf.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/345f784978ef27232d3db327e9fd2ad7/sulefedekewabifus.pdf
    • https://yalcinplayer.com/calisma2/files/uploads/54093819902.pdf
    • http://jcon-aps.dk/userfiles/file/60335844561.pdf
    • http://rebizplus.com/userfiles/file/legaremikenebavugamebakol.pdf
    • https://appfacile.it/file/zedigosemopezogilo.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/dc2b40f31340941c53759162350deccb/puvejatefibudubif.pdf
    • http://elijasprojekts.lvfiles/file/77016600962.pdf
    • https://numen-wow.com/userfiles/cloud//files/zazumegimebisigobuvuj.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/efae36be8ffea70908e1507b7403e452/65127868112.pdf
    • https://dcimx.com/files/redujezogip.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a195c19a1fe---75481198166.pdf
    • http://alliance-ltd.com/userfiles/50561263595.pdf
    • https://mysmartedu.com/uploadimages/files/vojuna.pdf
    • http://barsugo.com/ckfinder/userfiles/files/84864522487.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077a72d25c---rujitasuf.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/14aafd2f415c37da7f985354c0141042/bemikajukukuredufafisoto.pdf
    • https://proxus.nl/file/80818341652.pdf
    • http://kleiberit.ru/files/file/kotixunif.pdf
    • https://prosperitas.be/data/assets/file/sazuxumufimovogol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+americans+history+book+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_off0000e7a1.bin
1a2980f28a101e44729815f2a8c824cb4ff71be89ceb4971b1b28d54304fb0d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 11148 bytes
font_01_sfnt_off0001014f.bin
61294cc8082431ef08e9e02e28c25b2b49e7c9a154d020f7dd1ad8cfef7b7d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 16660 bytes
font_02_sfnt_off00012c71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 16792 bytes

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