Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e22614e6629c9c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07a60c9f356f5f2a7882be60002583a2 SHA-1: 52212741f363a73b6eb62fde2631b2aff103b5c4 SHA-256: 34e22614e6629c9cb0ff691240d243081ec814bc4bf9a4148296aeb70bff16bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics further supports the nature of the document as a redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=mx+player+pro+apk+cracked+free+download
    • http://ride.hu/images/uploads/files/nazepukezase.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/88399709316.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b16209e2---8059490040.pdf
    • http://evaemlak.com/userfiles/file///48848552710.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c48706b3c9ef62a4b90fbfa58a93848b/nuvotakudifibage.pdf
    • http://hoteldanang.com/uploads/images/files/mizofumojojoxedosiveka.pdf
    • https://rrr71.ru/upload_picture/rewex.pdf
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/vatifibara.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/40qbhdvd3hnjnpdobd5l7mfpjv/69752755162.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/9jlfkdq2ghe7qj5oav7vmmf9ll/208191905.pdf
    • https://digicpictures.com/downloads/93378766985.pdf
    • http://qhchemicalsfeed.com/upload/files/392047287.pdf
    • https://otoform.com/upload/ckfinder/files/zazomilixojofewedo.pdf
    • http://eraldocomo.it/userfiles/files/82047171470.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/kamefovokovivojas.pdf
    • https://hiroyoung.com/data/files/gubivusajakavilixagefujum.pdf
    • http://blesk-stroy.ru/userfiles/files/wuwusud.pdf
    • http://exms.fr/sites/default/files/file/79097898775.pdf
    • http://czerwoneiczarne.pl/files/file/foporuvo.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b54be9e841809e5157d2c917aecbac83/93562241099.pdf
    • http://progfin.pl/userfiles/file/77832059213.pdf
    • http://thebankcardservices.com/uploads/files/vozovidekizudalipar.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
stream_004_off0000eeac.bin
b55b1859aea871af99a8fcfa93ba26a2afb686970fce2f545ecb4adcd102743a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEAC 17548 bytes
font_00_sfnt_off0000be01.bin
f3c5678f544ddb091684ca5059801050217e823c4b0b6c5e0a26f9417e1c2103
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE01 10640 bytes
font_01_sfnt_off0000d69a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 16792 bytes