Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed51396f925f316…

MALICIOUS

PDF

90.8 KB Created: 2021-09-18 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e1b090bc72bca3cdd773b3cfdb3b3e2 SHA-1: 322fa0229391877cf564dae544e41b8fe3c11cfb SHA-256: 2ed51396f925f3167bae41159ec394e1eafabc63ab19590cb00be6e9eb4bf3ed
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or link farm campaign. It contains numerous external URIs, with several pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of a 'link farm' heuristic further supports the assessment of a deceptive link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rcot.by/pics/files/tarukoximotebikafubesumi.pdf
    • https://kstraders.com/userfiles/file/feluzilufatesafasugetoxir.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d948b5ff42---tutorubivudogulisiwixepa.pdf
    • http://bannhuaduong.net/upload/files/zulesiwitekemulenorup.pdf
    • https://habibitours.com/ckfinder/userfiles/files/nabaxefura.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f325af0937---26417993337.pdf
    • http://shinies.ru/img/lib/file/5844288776.pdf
    • http://driver-jazda.pl/upload/file/lisebagelu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fb1eafa7---pexitipopazabugogokupoxo.pdf
    • https://oancora.com/ckfinder/files/6236785055.pdf
    • http://immobiliareborghi.com/userfiles/files/35237001571.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/71391633532.pdf
    • http://palmdale.thepokeluau.com/uploads/files/bugapit.pdf
    • http://phanvienphianam.com/uploads/userfiles/file/milufifedamusarepijis.pdf
    • http://thietbiytedaibao.com/media/files/44736155320.pdf
    • http://cattaneoarchitetti.it/userfiles/files/42196482806.pdf
    • https://debo-fit.be/userfiles/file///93677214453.pdf
    • http://kcemsp.org/upload/editor/file/gijireza.pdf
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/30579149526.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gexaxamisin.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/92710164186.pdf
    • http://attlas.center/userfiles/file/65797221145.pdf
    • http://dakmet.pl/upload/kuxipejazonef.pdf
    • http://kovacsoltvaskerites.hu/images/file/fawomizifewexawalumo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+the+robux+when+someone+buys+your+gamepass
    • 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_off0000f9be.bin
0426097f53cedef806cdfe0d456acdcba4c0f612207bc8cd25413359f37eecc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 18940 bytes
font_01_sfnt_off00012b43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 16792 bytes
font_02_sfnt_off0001435a.bin
2cd2261aeb348c6718d94dde72eced74f9ef55a897a97b1439eda1bda61fd611
pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 11092 bytes