Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0c66d38468111c…

MALICIOUS

PDF

127.5 KB Created: 2021-07-08 00:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 37d52975dbfaf9c58aa05d4b31190f43 SHA-1: 2a6933bdb8cfb4f1f452d9e5d4f60f22da602000 SHA-256: bf0c66d38468111c8fd912ea7e486d1de3e5ae16ffead60879680043ac528012
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The document body was unreadable, but the presence of numerous external links strongly implies a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12c07bc49---taxikixanixidegupak.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/94713784527.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/xunogozetawazogu.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/5748752201.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/wasigogimelibiwawokuborev.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/70533548554.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/74306455283.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/sosopuvusilozobomu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/m6m9be89e6vs2u4pvfh5l8udug/xosadijavumuzuxabiv.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/bejuniluwudugoxofoxobe.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/162463138762810948.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/10629979893.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/828e42c5fc5747491d1957db2d3a57ef/88504509014.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/58944063587.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/lejujisumuletide.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/96699236261.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607249921f0e2---34832842200.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kuxufotukexedokotafetub.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160771d61524ef---megakusenemuvowe.pdfIn PDF document text
    • https://limsurdua.com/contents//files/25072269315.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/42119f3dd3ad38a80f7739676bdfdf14/6989455899.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1a4e22c1---10444656302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=four+color+personality+test+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_off00018f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F31 18236 bytes
SHA-256: ccb593db5413bdc902d604643f30f04f5b8ce964b79a2d92a566a53c1130054b
font_01_sfnt_off0001bf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D748 10804 bytes
SHA-256: 70a58b67334798566111285153600b4385e4b986310041a790618716d3040828

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