Malicious PDF — malware analysis report

Static analysis result for SHA-256 856317b61400d76d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-01 17:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fb837b84123c1bd6136aa7f40541ff1 SHA-1: b1e1d74171af1bfab17071c700b1a3897857b7d3 SHA-256: 856317b61400d76deac798742582eea031382736d11e16aaf636ebc0d2ac1808
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social engineering attack. The document body, though heavily obfuscated, contains embedded URLs and is associated with heuristics indicating it's part of a link farm, likely designed to lead users to malicious sites or download further payloads. The 'SE_CLICKFIX' heuristic specifically points to instructions within the document that prompt the user to execute commands, a common tactic for bypassing security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://infrive.ru/uplcv?utm_term=most+realistic+texture+pack+for+minecraft+xbox+one PDF link annotation
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103cf04aa2---48028093402.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d49ce4768b30ac20acb42c74fc83535a/97209961187.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/bitakuneropubedasezuso.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8e3852ad---50966645206.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607115f08bd9c---tasajojigonuwimatuluno.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3121f692349b1b337ae313431b78abbe/numunepage.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cbb714f206ad47c6894a7efa9c65d7c4/45390877992.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/af70458cb8f67a5b9c83aa4a6d4a6115/gixowitoxugutibapori.pdfIn PDF document text
    • https://people11people.com/uploads/File/88389906797.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/83152739614.pdfIn PDF document text
    • http://momsystem.ru/public/file/selixiwamatixekuzofogodar.pdfIn PDF document text
    • http://apple888.vn/luutru/files/51385517178.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/remow.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/us11ml11vhk9jk29hcbmojl4ic/41625287238.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d1478ae8---168790311.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/99crpnsm751fl0kjogsv8g40v2/ribifugixevituvukinepele.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/sg6kc76hhun0rda7d3epci37el/50998251821.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6485986449.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8123e1907---moxurilafit.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/97526967112.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3295ebc1cdf8aabaa91581a5f57d2fe0/lefopijof.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/xitadikifebulifa.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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 11068 bytes
SHA-256: 074743d883e8176bb4313a1ef39a988a189fa0a418a0992eb493215cef0858ff
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 17452 bytes
SHA-256: 3ff4f7fe8d8a88d0991c7c8d27808ff9410d83998de706bc146e1133a966762c

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