Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8925643443e427…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 00:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8784af0f53b2e469a94815bb30a92d12 SHA-1: a7d403bfcba23b5c33f112208fd8c0a236645132 SHA-256: 8c8925643443e427a5b4fc42ed3693ea0c0d554c9ff104388169e19b9debaf0f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The PDF structure and embedded links suggest it's intended to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073286a3de72---welaparix.pdf In PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/nakexumiwejisena.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210613_6A61C9BF4522A6E7.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/wolobojululudofuvuxorig.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/jesudelerate.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b236c31b---vegawutevuronowofunum.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/34985043398.pdfIn PDF document text
    • https://noddy.nu/images/file/47876677885.pdfIn PDF document text
    • http://flexa.cz/docs/file/43871219390.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/bemefatepelote.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/101129b49c92af46199b8f76034e60df/87293199555.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/poponatugafisumepisuja.pdfIn PDF document text
    • http://haai.org/upload/file/konotavosevob.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210821171039.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/mefuzigojib.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/vafokuresutub.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/mimelirasod.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/es19dv3ravsb1e40a1ea20bv4q/xakokuxedati.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16104805889272---keviwamowuzotekavufuw.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d30bc7362---59274773306.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/leruxitokubevufufamu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/tibuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fun%C3%A7%C3%B5es+organicas+exercicios+resolvidos+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EC 18264 bytes
SHA-256: 411532fbb84bc7d3b7c185161ec8008ce4098510f2bafd4b3145424ef49eaf01
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 11364 bytes
SHA-256: 45fa5a21adc1caf6d018a014fdbd009e6ef9526e8f898245681f373fa208d57d
font_02_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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