Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b36bf2a94c65f54…

MALICIOUS

PDF

90.0 KB Created: 2021-08-31 12:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76299ad722df53ac6318a0523d30a9a4 SHA-1: 65082d8115a46676697c6be6b39530c4de1961be SHA-256: 7b36bf2a94c65f54cebb830caed12ff830a156518b8f49bc2b22ab92995591fa
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_CLICKFIX' heuristic indicates the document likely contains social engineering tactics to prompt the user to execute a command, such as pressing Win+R or pasting into a terminal, which is a common method for downloading and executing secondary payloads. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://synerhu.ru/uplcv?utm_term=how+to+get+more+dedicated+video+ram PDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc9d68882---simufakamewofo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/53671150314.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kla9bc2191l45nvvluspujn15d/76817602948.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91563717437.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9c1c557590c2ce5c5a783bfb30a12338/kimosusel.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/dazape.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/17449651054.pdfIn PDF document text
    • https://cargotavio.ru/files/file/rodesivaji.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9d0d25534a52ba5cafa7e3918392eb51/wegagemutaz.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/rawuwapimewiduz.pdfIn PDF document text
    • http://zae.me/datafiles/file/xajesabirogefuxezol.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e3555437---mefenakeguzobonotazobibi.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/pukaxorisunetinipu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cd1e9e6b---solidinosev.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/72298750768.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0dfdd071571d93a786303541447e0d11/puvejufas.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/90aff2c71f2638d3b4626fbbce829776/zusuvijujumopoxolotevejep.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/niwufarezoduf.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2962e486418cd9ab5112f763cbb6253b/9202302212.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/67423891056.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tunokutelojatalijas.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/tagubijusitufos.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cee17a1c4d4---fareburikavirironebazuka.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_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 18420 bytes
SHA-256: ab135db857ee9a7e3973733c068ec3f0d118486ce1bba03bbe07590c2b7d9547
font_01_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 10536 bytes
SHA-256: e2a99a72c97445ddac8abbd1664d57731595fc4429ef80fb3031cffb9a5f1e91
font_02_sfnt_off00014105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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