Malicious PDF — malware analysis report

Static analysis result for SHA-256 824efa1a0c5c233f…

MALICIOUS

PDF

75.0 KB Created: 2021-06-27 07:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5cb89b36d3cfd682002cf3bf963dc4b1 SHA-1: efd94fb60a20b752498e20949d56aad7a68c5083 SHA-256: 824efa1a0c5c233f4a20dbf289a0d9ecaa9109badb231ebfaa5c3edfd14d6dd0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=yahoo+answers+and+questions PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29114aee99---zorugonemixevibawiwopa.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/92918872247.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/raxofagidovemusepogemuwi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2c8963952a6e1c6e75d2cdba9e042779/pojolojajavowajedom.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbab15802a---zelamotomoxibebikesub.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vh133bf84i0pl39uviu609udhs/jukapugebiduvomowozoris.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/64029035034.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/patekekipitomudepanux.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55f433547---60215437420.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a53613576---34613725006.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c013930f0d---zawulefetopuf.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c5af2106b6d63c0f2fbf08959df2bed6/ludapatitesowokijedi.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/28569020448.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/vaxaxemono.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddc674e46---figitapapebobadagikarapit.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1398c8e709---78485038070.pdfIn PDF document text
    • https://rosycaffe.com/file/levobir.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c491162dba9c49d5be9d9029e2fe8c2f/40789467117.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/38418025863.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/rimoto.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9i6sb8bbgo3cke3oulks7cf4q5/79730119271.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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 17172 bytes
SHA-256: e5b55a072839446218e5193a52f79837dc6de696f459ddd09e16d9a0cc3abca5
font_01_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 10616 bytes
SHA-256: d6ccd46f549810fbd5883ca41a26b065cce6764918398c20689505674b1642ae
font_02_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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