Malicious PDF — malware analysis report

Static analysis result for SHA-256 158b3b29ee1afadb…

MALICIOUS

PDF

97.0 KB Created: 2021-08-10 16:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1e2cf174fa97d7039697ce5b4727f9b SHA-1: 2326196b49866de4f45fc7a19efd5625a884d555 SHA-256: 158b3b29ee1afadba93056f646e274a91a88075385382633c1185cde569b3f14
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c337bb5ab3e36b8f58222858d42f2953/zajifelomik.pdf
    • http://greenbrier101.com/userimages/wifanopikakilujizap.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceec62de4d---gudepo.pdf
    • http://freewest.at/28918409695.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8f27a07cbdcab11949c9f1a9194eef0c/teduwidinilanixuju.pdf
    • http://domeinbeverdonk.be/assets/files/file/21889211151.pdf
    • http://swotaweb.org/img/upload/file/47532573641.pdf
    • http://evola.it/userfiles/files/47666792456.pdf
    • http://hyundaiokla.com/uploads/files/76269973818.pdf
    • https://autosaloncenter.com/uploads/files/rewukobatiguborisefunadi.pdf
    • https://eyetracking.pl/userfiles/file/judavuberapiro.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/76uh9q1psgfbk0e3u082n05kr5/xegaziwexuxemosesisemad.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a1ed39fcc1792cc96cc86303a116ac5d/gedidaxop.pdf
    • http://sgyscom.com/upload_fck/file/2021-7-5/20210705034741807674.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8678066eaa---bomelo.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/518705ead48197a3bf59cabd8a437d34/35805539921.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/11615627106.pdf
    • http://dogninja.com/userfiles/files/mepene.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/27534160934.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f33aba465---valupebulebilomo.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5a2124cda31cd8f12a2ac79c4389b911/megasozedofolamejodez.pdf
    • http://clinicoral.com/img/userfiles/files/61824970662.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/955bbf96e6f7595904f25adaf079257c/dekapovimapegipibu.pdf
    • http://eca.or.th/ckfinder/userfiles/files/mepinimejukowubazadeloji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=teste+para+saber+que+faculdade+fazer
    • 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_off000115f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
font_01_sfnt_off00012e07.bin
dfd0a4639d700ff6e0770c25947d20883d0b658c8bbc81d7500c81e0424216ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 10704 bytes
font_02_sfnt_off0001465d.bin
0bb1c669e6844d1a0a9b712c51729d82d92cccb8da309849ec5fbab83d1fc957
pdf-font-stream PDF embedded font (sfnt) at offset 0x1465D 18600 bytes