Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59d7b3c34e829c7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 22:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33611a4c7e57a9526c559889cf29bfd1 SHA-1: 2356c84eebd44a9183373a93b8f05b4bb43e60b0 SHA-256: e59d7b3c34e829c7d81ed4d30faf90c3b5c578a7cbed231b8a484c5a0d545400
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://barrospizzadb.com/uploads/files/zusawusawupumo.pdf In PDF document text
    • http://seibyou-koujien.com/files/files/sezomodagegijowi.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/marafomolakubetanevibu.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/sibiwopewidobilepe.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160847c42363d0---xuxujapelodurenakiw.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b94cd848425---saxuwini.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/mituwu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fc7d98abe4d3a392a390ffe7f2ca58b2/memalonudawolexu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b148d3de89---86559401244.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/gedatin.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4ff51174669cb4c382c50dca6e59f91a/razekazepetebakelefigu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1c6f6ec1f8ca439973720e4dd0ceafdc/3522764964.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1jr2el0n22ol3rqh35ks6eqhu3/76077264919.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778c9c2a7aa---12961340688.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/36147398221.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tqrucru77nuavfv78plm09t8j3/kibivewanemovefimevijo.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/lirajipazivelafejobigiz.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a14453429a5639ec6de2eac467210afa/57051646485.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/77714954238.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/tepitavub.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/kiwaxezesube.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/afabb711daf0e55ca8039c5b5c695cf1/93627864044.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/tarujaxudanemelifewu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/55030446239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=plant+physiology+class+11+ncert+pdfPDF 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_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 11068 bytes
SHA-256: 04e294721bd95947465fb776b5ff22933ccac12e8d7fc9b9ea38419f678702a3
font_01_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 18316 bytes
SHA-256: 4c9c88f5585b035ab65391bff155b814be0eb3220bd9d0f777910e2a4deeb442
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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