Malicious PDF — malware analysis report

Static analysis result for SHA-256 df79a3b573076dfe…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 03:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27990f6d00b56c891c9f69eb657bc7e4 SHA-1: ddd3a4a8c92c2077149dd5b14748e1ace7358801 SHA-256: df79a3b573076dfe73d9bae7aa1fddc46aa3dba8b92a6a4d4bac8b3f8dd6b660
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of a 'download button' heuristic further supports a lure-based attack pattern designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=how+to+root+android+phone+manually+2019 PDF link annotation
    • https://thietbivesinhsonhoa.com/webroot/img/files/74249075855.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fvlhf59tk81mpkfkgjth4um2l1/71575139350.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f56deae1---83669399366.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7eb8d479f---81594271187.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/dufiloxodivegusotosotes.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210811042131.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/55472269311.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/18373458147.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/17748555665.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077909fbad71---76213354995.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sibapejubodepesimoz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a4e635e0b65cce3e5ff2a990bab9d7d/4801444308.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fodejireduzop.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb6bf3457a---gemimumoxabad.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/19535346391.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2b22aedb5b25b06e33dd7ce93d8c81a9/73217255758.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210722020908.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481327679d---ziwibemuton.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/92125891270.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b336fb31984---59365938749.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/191555618612345530196e.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/132d126fb836e53846f48a31907c5668/matogulotuvubuveliwawimo.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_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 17400 bytes
SHA-256: f4366ec24ce2cb3f3019b7a7ecbc062e2084ac71cb10816a3bd2758881659a45
font_01_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 11244 bytes
SHA-256: 3eb72d6c92105af7f27df059f1a14a602081bbc7350a2699b3be4293a1c5af16

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