Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56aa47ce816aa70…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 23:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 425749a24c6a9d435ce088677b26c379 SHA-1: e6bf05c4eba494ee72eeb1db0df00012d4b8dfa0 SHA-256: d56aa47ce816aa7038657d6c1730d9baf10e3cd39e95a28152a7028d35dd35bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://adepotcustom.com/UploadFiles/file/20210429235756122.pdf In PDF document text
    • http://azizolace.cz/images/file/gabupi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815e7f7ca5b---lamivuwaxoduzifu.pdfIn PDF document text
    • https://redac.ch/upload/73664452682.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/puvamulunok.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/lisuxitutozixukire.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/fibom.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tonujemorolozivapode.pdfIn PDF document text
    • http://flirdining.com/uploads/files/ponabixejubetugibosilina.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0ea031d8---marigufunewuwojabosiwifi.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/23508481652.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/90151600303.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6b4b232147fc26703e8aa080c5638aaf/mifulatibo.pdfIn PDF document text
    • http://flexa.cz/docs/file/85734534837.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/53204999502.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/86716998273.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/gitusesubuvobatorawonojol.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/74c8be66fb2eccb08070f3d6ee0242ef/34865072768.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/48608845925.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/74127340719.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/48219207119.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/dutemegobofuji.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/448tc4qukhm6h2mbd0mughl0o1/tuwobanojebur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=earth+materials+introduction+to+mineralogy+and+petrology+pdf+freePDF link annotation
    • 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_off0000b34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 16244 bytes
SHA-256: 2c0c4ab6aa14ceaab66ca97e5f86ef6649ff7e6bf40e6405d84a46ea6dba7b3e
font_02_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 11264 bytes
SHA-256: 3b173fe6406cccd376a9e139471a4e3750e01bc7d78f6bf8289051cbab7aa277

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