Malicious PDF — malware analysis report

Static analysis result for SHA-256 f256ddf2dbd30aa6…

MALICIOUS

PDF

119.0 KB Created: 2021-09-17 20:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 28ac011de586eb17b2af49707ec36a1c SHA-1: e1107e546c1fe39a8e9d2b27f4d369de40b709b3 SHA-256: f256ddf2dbd30aa6a5f6339285b660e3f48fab4eacba3c07b4fe953c91af3415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=android+seekbar+thumb+size PDF link annotation
    • http://thai-apsproducts.com/file_media/file_image/file/sojejirogafeladuwi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/1165219295.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/dubafetiwazuwefatiwasunu.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/1812250460.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/93145973273.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fe5j030c6tegsutpla036du4ma/tozugeki.pdfIn PDF document text
    • http://18554080.com/userfiles/file/76796491448.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/14356697734.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/28931482877.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/gefegaw.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/fumilagatavofazilopesenu.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/teredetogerorikekofotuxex.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/ponevofop.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9638054b8---masenakedibeb.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7c085610228bc53b514c44a248717a0b/48146409878.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/cg7qm1lv9u8hgaimt6himecmbn/33489028742.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/pigezisiwikol.pdfIn PDF document text
    • http://vhshf.de/File/52669975970.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/79554235001.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/56781920461.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced50bc1cd---69333178598.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/23298236732.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/73445326738.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_off00016d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D4D 18284 bytes
SHA-256: abaf4337767327206d02c6314e9e558d7abecebf3b7c48d630e512ed1346092b
font_01_sfnt_off00019cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CF9 10840 bytes
SHA-256: 1003fe07a95455ef76885e20e925fc9b06368c65686ffcb296bf1166574576bf
font_02_sfnt_off0001b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1