Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7a135533f2210d…

MALICIOUS

PDF

98.8 KB Created: 2021-06-27 12:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c33318d6da957cbf68de6150c1f81906 SHA-1: 5400a43eabdefda02bbc49d7139984c7c9a4c7bb SHA-256: 8d7a135533f2210d32e95b84683729bcb523327bb2fba527b65e9c5c50d1762c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ketchas.ru/uplcv?utm_term=swtor+jedi+knight+leveling+guide
    • http://crescentcarpets.com/userfiles/file/resuzi.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f550306686b9d747275bb3a016e826ce/74621910349.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607190307ec01---12173339571.pdf
    • https://caribemed.com/userfiles/file/zoxidunogowezaku.pdf
    • http://akicgiyim.com/userfiles/file/92118826297.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e76426c0---ramexaganekegu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abc30ce1130126c25dced148f8afd7cd/dajovowakuwafimiwinerawox.pdf
    • http://kovacsoltvaskerites.hu/images/file/31934690971.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9ae1ab9f7afa995fa127d3301b123215/delekisotadiri.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098772016886---bezimipoparurap.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9cab7448c8763696c1b2cb10a89bbf93/93134447556.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2c3a7d098d1f21f57cf6c0631d8b6c79/44124716285.pdf
    • http://softwarefactory.nl/images/file/72828365958.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lvja539eljpreq2t0p86p6cvu7/34207253226.pdf
    • http://changju-hotel.com/CKEdit/upload/files/52294177767.pdf
    • http://argyleliquidations.com/userfiles/files/27524685962.pdf
    • https://vmwarts.com/ecovic/file/suwojatize.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7480e855fa---ruximejafazupogimu.pdf
    • http://caopump.com/admin/userfiles/file/zokaburesebiz.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/43400480495.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e364538d93---82492983276.pdf
    • http://casavacanzesanvito.eu/userfiles/files/gezitan.pdf
    • http://macautemple.com/userfiles/file/88903383874.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sivorinidarogija.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_off00011c92.bin
546ce6b52990b4671bd59acd0eff4fba05ac40ab642520f6183c4ea1e2669703
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 17916 bytes
font_01_sfnt_off00014bc4.bin
3dbf2b5c967edf5deda232e3faefeb803aa54eae04e96eb665fa16e2274f0985
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC4 10748 bytes
font_02_sfnt_off00016431.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16431 16792 bytes