Malicious PDF — malware analysis report

Static analysis result for SHA-256 303bc1c71bab3fb9…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 09:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19a8b03ad942445b873c6e09f4b19626 SHA-1: fe37ee860dbcafe9e4c5b11959bbf65697482be8 SHA-256: 303bc1c71bab3fb98ed63ec74079d17b73c1121f3f4f7add9491b074167b0f37
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the document acting as a link farm, directing users to various compromised websites and potentially malicious domains. The presence of embedded URLs and the structure of the document suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=what+is+your+base+salary PDF link annotation
    • https://ajwatravel.com/wheelmarine/userfiles/file/givebovelavixuvamivizun.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5ee5420e29a336ab1179049e04fb8653/80334628467.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b1badd99d9239ab471f56c0368d3176d/26171053558.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v1bt4ccncj2un7oc9v2ldk8kbo/rumupebijudo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/05dm3j8mbeekhvdd68nvpqjgj3/zonagagimugo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/diparatirubata.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/eij7jamf80daerolgsuhpvpa5d/479105453.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/fl8qu9f8av5jp27stjpu9q7jt8/49278266981.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4nut0r0f2n0t0qndr8ji7m78co/46859556504.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2d33ca82---94584253839.pdfIn PDF document text
    • https://aokman-drive.com/d/files/34306544913.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46f31a3d4---21722997212.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/847c9e8898e1319ccc207802fa29a19c/fuboxomunonor.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/mirosumisilel.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070878592236---74117465318.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/21612464274.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48776188e---91013158951.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/gonetidazezil.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608121d32ef2c---54264470931.pdfPDF link annotation
    • http://golden-candies.ru/webroot/files/files/17190197.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607168ec3b351---21350511955.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/53474172942.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fl8f4j6sfd2he9otal59piqqlk/wavotug.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/52bbd42f74bce8726334c8c6f963f5a6/luxirixavafipuxina.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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 17028 bytes
SHA-256: 147603d7c15f78f7cf30620486fe302872809f0a240927b732b2c4307453f1e6
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 10448 bytes
SHA-256: a1108cf14062b959ca5dcca66873722b1aa31badf5974693387dc7b0f0352d0d
font_02_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1