Malicious PDF — malware analysis report

Static analysis result for SHA-256 158ac841b6e9b858…

MALICIOUS

PDF

85.2 KB Created: 2021-08-09 07:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd239432c71e37a3f4cc295efa875ebf SHA-1: aad38eb16d872a7b40903f35395c04a18879493d SHA-256: 158ac841b6e9b858c8fb1df0a6355e7ef30f2a1df481f5371cc184312c612c5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2c819fc---95488717573.pdf In PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/bamowet.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/sudazoze.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/77d53b323eef1cb99d9b445063b1b6a4/61389038507.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/repetejezogapivirokemol.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/26186906774.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/41fd8b6e8987e91433497d7fcc786ca2/kevametubupomarazimiz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9a5e17e90e---25857419273.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0iu1ql5c88009okbi2877k29gg/92748524488.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b57abd0134c---bosogimibuxeza.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/35f528c9cff79a6d88205a5d488ac314/41003469322.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/86235219306.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/33407899746.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a50d8109ff3---49496196341.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc29abccb---kezuseze.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/3894355529.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/batizujajo.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/37792641973.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160713c950d47a---61515548395.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/53511633364.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2c7cb73449f53146db5cd4d3ebe4a4a1/kifagi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/79713981993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=convert+indd+to+idml+without+openingPDF 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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 17104 bytes
SHA-256: 96f8e5f03a6905b81310c4acb453257d66ab75890b3b7df7fb80e3cb2585a82e
font_01_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 10792 bytes
SHA-256: 8d0bd20cd674b2a5b117e8d72bddf973772ab8062dbd641696e465bc7bfa01f3

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