Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a4d789858a892e…

MALICIOUS

PDF

105.4 KB Created: 2021-07-02 20:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 950bb9c759f172c9ff0f76e7f3d68125 SHA-1: 68cb23f449ab6d9185763f7d66475cf1ec2ae2db SHA-256: f2a4d789858a892e528e75727727df9924640ef21a03c0894e35d8a86c88fe27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of numerous links indicates a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://crewmak.ru/uplcv?utm_term=surface+areas+and+volumes+important+questions PDF link annotation
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/jafefe.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/daadb3bc6db3f8617ed74d693f9bcd1f/60292328762.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/85657701373.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gizamujukarul.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/82115733421.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609453128377f---xagokukobokuji.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fb779029ea2c91afdf53c8858c6ffc34/bibisawebopiko.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/winigaxiximadekadodi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/bimufas.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9qopdlpl2pgvq5461sa4f0kcmq/navuri.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abb02e6bdd6---vijimapata.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60cbb966b8ec0.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qj9snsdo1900ne2dnsj36933a4/sijojiduwaviwasisoserode.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/43128382936.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077875527ec0---35577210822.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6580dc32e---101983235.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tadn48cdr0j3band3tgg5q4t41/55433871895.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/7707078109.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/56b8b6e533d966193318c77f1b68789a/rajitimelajeneseku.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/12778710743.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9b683c74ec11621a9cff34688dff92d0/tudanurofi.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/sidewuxelosot.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30db31878---sugosaxotulezu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16284 bytes
SHA-256: afd17be92c2bc1246c1af03afdcb2f7f9f11bc2c26987b88e0047cce369b02ee
font_01_sfnt_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5C 19160 bytes
SHA-256: 9598ad458c0890005c7759588e55bb631bbd5ce1e2e6062141413c9bb30ad0f2
font_03_sfnt_off00017ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DDB 11168 bytes
SHA-256: 406a0c16b675469d867512f450d07a34ef43172561e5ededd8c090156f0ff0d9

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