Malicious PDF — malware analysis report

Static analysis result for SHA-256 a814302762de3a56…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d81d4195f80b0d699348a70a6523c97a SHA-1: 0febc37365f1d1aeafb17466df0d7ea1c501eb46 SHA-256: a814302762de3a5660de7f46222657279c74ad8709152696354d1c18459c9e6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=root+apk+for+android+9 PDF link annotation
    • http://gniortho.com/files/Upload/file/tobosur.pdfIn PDF document text
    • https://aneri12.eu/res/file/9058868534.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/baximejagowibawudu.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/47944045668.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/gakolufotezun.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/ganijuguwutululunuw.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tijedaxafasimudek.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/golifap.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/radoxemakesikonatejuduke.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/detofox.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7c615fb3---24831678073.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/473326dd1bae43ad15c5b39fdba30a47/16982391489.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210911114152.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/4246158094.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xakus.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613011474078c---finuzez.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/fuwepubabor.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130b11167eea---regitimonovoxajonef.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/lafilut.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/17178111720.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/nizuguro.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/sowimejesagaserowixotu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmupocq9nmnkkt1b5fk4gokfe2/87945650319.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/89982483393.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140f584a8ce1---64849951001.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://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_off0000b97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97E 16328 bytes
SHA-256: b82b53472e354dd8ba9356baf43a040324427af56cee73e0564e6a5972cf57ab
font_01_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10452 bytes
SHA-256: 2439289f6273048e2523838ce89e69a0dfe10d4590f4f8683c5f67a9aefe4325

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