Malicious PDF — malware analysis report

Static analysis result for SHA-256 db38ee8c0bc8ae6a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 22:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f201058fd23cc60b690eb2098aa3c972 SHA-1: 203c16a4198948be85536ed6a3d5afce538cc8e3 SHA-256: db38ee8c0bc8ae6a90168a2d4decc8bc889c3597ead988c625efa92d77b62a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://signauction.net/userfiles/file/46934326823.pdf In PDF document text
    • http://aqs-group.it/userfiles/files/26094184232.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/jobazabajujegujorepojotin.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/62766451510.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/nujenusowofemedojod.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/da6b6165320658a3722ca0762015d3a8/poxesozejapofu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc02872485d---9633802447.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099c740863d2---27232132951.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a00a3987---36023080479.pdfIn PDF document text
    • http://firegallery.ru/img/upload/85227306338.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/75953983623.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/c20b281c61926babf481faee8a2d1a0e/wejaremetewopabobotap.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fefawerupeji.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/3062528335.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/mewivaz.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/15273940410.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/19e22d2ea86caf4b2438e08176aeb810/18158184829.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/96761963216.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nakagimavuvaporeluz.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/xanakixebuwozudedew.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/30837144335.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/aca92c3666f8c1bf16ac15964b86ee70/kagar.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/p2hr6rnquarrvriehku19msas6/79749148873.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1d0c9e51---tamorugobetatuxegalil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bailey+and+love+pdf+vkPDF 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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 10448 bytes
SHA-256: 592b23293aaa741a20b7a69a98b0a232a3eb51946a331d766f46d7825dcb2ce1
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 18408 bytes
SHA-256: 8a68513bc91dfb3f0c825b9e0eecb43835d2cf63b7ee8e9b3e5e14841395dffa
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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