Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2a31108e1fc3e7…

MALICIOUS

PDF

111.6 KB Created: 2021-07-02 08:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bbde9b9ef67fd43608b4b907a901dae1 SHA-1: a58cd515ffe99605bfc89b1d694f01bb59a2597a SHA-256: 9b2a31108e1fc3e7a07604010f70705c6a1e2ad659dddcb9560df2dedcc7ce13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards a tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://cructi.ru/uplcv?utm_term=senior+lecturer+meaning PDF link annotation
    • http://wohingltd.com/userfiles/65212024864.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9ef62347---gapalojovimupomapedoguxa.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/kaxenopen.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a868946df32a7535ad4077a75b9bcfb7/75338117704.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/nekojojuwelilekaxu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/18266847918.pdfIn PDF document text
    • http://alltechsro.cz/files/34354128669.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j2sf6lg2id77d3r5vlbi60bd81/dusavidugewidigaj.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5d865ffb---6353132962.pdfIn PDF document text
    • https://mmszke.hu/files/file/99720780038.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b00da325b---disineg.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/81291559025.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/pesilifubutewutotexinow.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6a38b6b5483d7d213aa801fca4668e8a/21803523274.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jovoxojojanemutu.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/83551866748.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/nedilewubavo.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/4849468828.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084df7f3eaca---torafovofufagosikonu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/24243649499.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af5b6716b0a---90485037314.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/78964832936.pdfIn PDF document text
    • https://people11people.gr/uploads/File/pefefes.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/0tsnnbbhlh96pbbbosvvgvk0fg/41516118865.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016dd7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16DD7 24212 bytes
SHA-256: e0639537ecf9151bd6897e49bb839c4bc812327fa511fb9a35ac4a5d453fb1c0
font_00_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 29812 bytes
SHA-256: b35266ac9139ebc3543fb016ffaeacf8fb2278836f90e1c784c164ca09f574dd
font_01_sfnt_off000155b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B2 10580 bytes
SHA-256: b70c166fcfe5bec9324d92c8316345498ca97eed6e3fd182fcbb3e7f250f2f45
font_03_sfnt_off000198c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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