Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73542897f81ddee…

MALICIOUS

PDF

102.2 KB Created: 2021-07-17 00:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41f1e2f110c92677ec074c52a2342146 SHA-1: 7b43a9b26a957c902d3a831d267e5119cde2ea10 SHA-256: d73542897f81ddee95b399ff51605ce2b7085d46b0c239255fe54cf4b25fe62d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hf0ehc3n5h60ja4eh4sd1jnvl5/zuginojuriboxagebevoj.pdf In PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/ruzuvosa.pdfIn PDF document text
    • http://hzqzg.com/d/files/mumevuzixagu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/92391650469.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc77aca0bb4---53858511072.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/kemojirotapokibog.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/18/file/20210518_061915_186.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa59d0bd8---43242724156.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/waxexuserigedafirotoz.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0c3ec86bb1fcb7f9a2b4168775ed4d20/xapalekanel.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160995843534a2---74265351790.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/bonajepazakax.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/47326753225.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e97867b5ece374e7eb33711c5a44b7b2/13843322890.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/77732574834.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3c2bcd0b---bizotobetatosisixag.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3dcf245c6---nefanujirixoloba.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/53753674025.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/88505943706.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/19280340738.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74e1c18c4---25965916940.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b658e6758---91192353079.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c8e04b550---99888974366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+russell+girl+summaryPDF 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_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 10412 bytes
SHA-256: 71310b2a3e27f76793b1d79fb4886da80b28fe4f34444abb4f316e236f50bce9
font_01_sfnt_off000147b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B0 17052 bytes
SHA-256: a20e972f915bb30ba246dc4e6926675cb927323bee1224ec2f29ef0ebc7538de
font_02_sfnt_off00017439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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