Malicious PDF — malware analysis report

Static analysis result for SHA-256 495c00cbfbaab733…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 12:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40b6cfaeabd375354b0f11cb8f3aa1d7 SHA-1: a70ab3e36e1ab509239f4726a806b27fa77339ad SHA-256: 495c00cbfbaab733f0242fea3a2541055b167265adb25b5b6e76b3f97c114b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload sites and other disposable hosting domains. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=vespa+gts+300+hpe+user+manual', are likely used to disguise the malicious nature of the document and lure victims. No scripts were extracted, but the overall structure suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=vespa+gts+300+hpe+user+manual PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b901cce9cc---pakarefivitasovavij.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/kuterutolagofut.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/79132435494.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161296bc9027e8---94283465961.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/34092562924.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/ripusokijevapemot.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/t8c3o1dha73i8r5jql0v55ud35/84133294452.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6cbf354b4a51ba585377eaca1c0e4f16/45399467668.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/2839625871.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210901/file/rukatazu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4ff8c1940---30492318182.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/941806fbcb62f376bc96204e2da8972c/kiwodajor.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/45142534846.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/64527746660.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/lufusokuxifowazibokiv.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/ligagijixebimizogawefot.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61330184125cf.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d42b41204d6---jibowubijijuvufup.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/6299896119.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5e0df737---nifema.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb01358946---63633549128.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee92a25871---kuwagoxi.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/45346130764.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/47321521066.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/mogobisipenozugijoboneg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 10848 bytes
SHA-256: 05107e651301f916de11ac19c758db2307288da676bce1405762214e303b6394
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 21348 bytes
SHA-256: 81047b9486397914f5da8760c9c1324fc80f407008e4e5f27709cf612b357a1e

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