Malicious PDF — malware analysis report

Static analysis result for SHA-256 338c6b645b54639c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 02:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fd5d6ce53a6c308e55aa59010776b24 SHA-1: 8a9303c70549ff7475689b129e6b78d0a0fc4fd4 SHA-256: 338c6b645b54639c256f32e61f29d5a6927f6164a32ffa96cbdc0b27c62460ff
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to multiple compromised websites, including WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://preiswerte-unterkunft-papenburg.de/mediapool/sadogalojatorami.pdf In PDF document text
    • http://onlinevay.com/upload/files/5261691517.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408c157fee2---79720412331.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/fusiwixawozitefazo.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/xobuforunadolu.pdfIn PDF document text
    • http://workontext.ru/media/file/27987846808.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70baaf13---baxibiva.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/16826949641.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/wonubipasawetizekelomal.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/85096936918.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/didilupowi.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/tepono.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/59069998089.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090300260270554.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/49880740062.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/14519674374.pdfIn PDF document text
    • http://gazetavk.ru/img/file/41886543939.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e8fbe64c416c7a06b04023183160d109/gaweni.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/tisuvuxawobodenitomu.pdfIn PDF document text
    • http://c-amc.com/upload/files/84240679671.pdfIn PDF document text
    • http://platcometals.com/images/file/18567079082.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1cd3b5d53---63301615089.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/16662751327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=roms+for+ppsspp+for+androidPDF 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_off0000c378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC378 16540 bytes
SHA-256: 642b9fd7480629aae624402e3c78245b40ba2d09d25479ddf7b6e7edcd9fb237
font_01_sfnt_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 10428 bytes
SHA-256: dff7637609a6a19b4236ab44fae36e1b79f7281eb0feb3115593018fb7241339