Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e42525c5a7ae0ae…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 10:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70e35eadcd4e88a690195985a746b261 SHA-1: 3ba918310803d2f7ab70f63e20359b2ee2c8d6fc SHA-256: 6e42525c5a7ae0aec42e235391ed7ed0579d372af9d4098a51434cdf0281f527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm likely used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://073741256.com/uploads/files/202109110205236872.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4eb6198d---68663210441.pdfIn PDF document text
    • http://fullx.net/files/81820048845.pdfIn PDF document text
    • https://icbacademy.com/upload/files/tekitur.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/pijekinuf.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/nomudexare.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905010756.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/piloxubegazakisujeket.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/84972395742.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210902064829211428.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nupasegufogudedemive.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351d9719d51---98821574091.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/wozekuwebozokolunelafulo.pdfIn PDF document text
    • http://hjhchem.com/upload/files/xoxulewusej.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6d9e462a6b93928a027c0e0aa3ed6e3a/xosuwat.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/sarugasavoxun.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/55933675308.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/tunitun.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/54742721623.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/44854620363.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/kusovuwapawijisuv.pdfIn PDF document text
    • http://p-energo.ru/content/file/73537832863.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/84162151207.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/larofifulagajofaxa.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/461497759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jak+doda%C4%87+pulpit+w+androidziePDF 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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 17808 bytes
SHA-256: 29382e6b4b35466ae364df2a9b796e897649f7d7a450d559af373cae9f9460f4
font_02_sfnt_off00012a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A07 10684 bytes
SHA-256: 8c7bcc33390380c222d76f35bd747871861ace0f75037bbd104e5389ade5feb4

Open this report in the interactive analyzer, or submit your own file for analysis.