Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9edb907acbab6c…

MALICIOUS

PDF

81.7 KB Created: 2021-07-24 00:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 482250c93cbe81662feac343065f6f47 SHA-1: 25608affa1fd9fe0e99e815d7c017bc409a9e138 SHA-256: cc9edb907acbab6c0b31411ff97e3b522d1eca5dffd3b7622d48b4c0c5e96983
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf23202aa03---sujizogokirakotaxawo.pdf In PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/xojokoziworiwizulomirire.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/72425300836.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/ff49b5a055313b01f87c91f8d02494c0/99149251521.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c2654f58---73087605304.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dd0612d25df59d1e513965ef07fcfa7c/32388370131.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/24301660325.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/is4adhvt9o3raic2i07likd4kf/84302642009.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/rufusobedurifiroreze.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a12c672bb2ac677f8d75819279de9dcc/roxuzatidix.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kilipogulerofabapusonanu.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210714_8F54208F22F2F1DF.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/35774746863.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2256555ae307ea706c7a71c99ac4ea71/fedimux.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/81711330406.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/51875218283.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb240a32e8b---23037537275.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b6ae2860---gipanakoba.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5203b81c2b---fokiligizarutexipus.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/72fe24eab79e2938fab7a2b6abf07cce/rusafonesedike.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979c4abded2---fezinomimigigewere.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3e305d5f481b1e5ea43cbc195046d932/20991228428.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0ddm2t8570bqki1qejgd99ure5/26779730879.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/28471653442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=printable+nursing+dosage+calculation+practice+worksheets+with+answersPDF 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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 11212 bytes
SHA-256: 023ccb5a659df9ab98385e7ecdd269e6cd02871f9afd762a2a2e162134e4102d
font_02_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 16732 bytes
SHA-256: 777bb19b8c200e7c45629a13816e05b66bcb3750a0b370f7a6be8b090254154a

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