Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22cb5068ab88506…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 07:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: faf98619354917e31e6304dab8db5154 SHA-1: 1f8f5de187b7e1a51989aff91feb4a0ff4cc8fe3 SHA-256: c22cb5068ab88506f34b11627706f3953375c3295498349739027ac82242dd19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://bmw-zona.ru/uploads/file/depuz.pdf In PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/sibomaguno.pdfIn PDF document text
    • http://isvpro.com/custom/files/2736636383.pdfIn PDF document text
    • http://contelex.it/userfiles/files/2477568467.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a963050e39e---38824480394.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/rorejagokewejegegawolexi.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/ruseduvi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf31a04d12---rogiv.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4a2e0f7d446ae5a90b9af6fcc093b4f4/kabexexakipevoparusu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070807493050.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/65583060285.pdfIn PDF document text
    • http://micruts.org/userfiles/file/91297205012.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521102856352219.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441fe88d3c---92108808466.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f921fa6a---rejofojakuzugugavudono.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/28a221927bfe2f9b9aab4c7b4e849087/roxowupugapolevulok.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/kfvgtlrq3dcn33hj1vecenb6jv/97906192509.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/jotopajaweboveza.pdfIn PDF document text
    • http://teakdeck.pl/files/file/gijuze.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/rosoxixa.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/65712e8de7a010036a2f83a3c8f1d5be/8469817413.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/44495932562.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2eb15331b5fd0dfb8c43b4c3069fc2a0/4415393125.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/80103139061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rrb+je+cbt+1+syllabus+pdfPDF 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 17356 bytes
SHA-256: c8c11979408bbcfa25f00b6099956763b06390b835f4b7c4d08a46e14b380508
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 10880 bytes
SHA-256: 1853ef160b595d21ab25a8bc4d39c1aee23eed99ad79b02aad846f55820f3d32