Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a3195f2c1e8797…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 01:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 412e211d4d19f6ba660c6fccef6d0497 SHA-1: a682449cd388a08ec69c8332a8d6c8e63e9a2b17 SHA-256: 00a3195f2c1e8797c496977fbbc0ab3989eec90361131e5dbe6ae4d9bc894e8d
196 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. Heuristics indicate it functions as a link farm, directing users to compromised websites and potentially disposable hosting. The 'SE_CLICKFIX' heuristic suggests the document is designed to trick users into executing commands, likely to download and execute a second-stage payload. No scripts were extracted, but the overall behavior points to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pistant.ru/uplcv?utm_term=how+to+connect+your+ps3+controller+to+your+android+phone PDF link annotation
    • http://mxagproducts.com/upload/browse/file/16385637507.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/57197873951.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c7nvdjmmnsq599mu5jnvdjaskf/ziluvabexesivijawosefi.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/33510519430.pdfIn PDF document text
    • http://skolky.info/foto/images/file/72624977756.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-9/20210909213327558842.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/98251148024.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/kutin.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161397d9e37aa3---74540884163.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/gimexun.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/55089506978.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/lakopuwuge.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9872a0c0---muzezejijepifovotuvin.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/sirofakowetedos.pdfIn PDF document text
    • http://alcantara.cz/data/file/bapexoratiresagisaxusu.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/jowositesosugu.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/bedusikudiviv.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/91707735379.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/javitebogusure.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/sajidepavodogewomafu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/58713096223.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://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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 11076 bytes
SHA-256: 3e4321e618718a53e2b91cbd2ad788d5311122174fcaee665d317aced783a100
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 17836 bytes
SHA-256: a41909d9b027549ce72fd1f0383c5473123b61157964e2fc907a1f0b8bab7d36