Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d640bacf82a8a9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 16:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 636de49ebc2147d78314469ff0e263f0 SHA-1: a1c4c14db41a685aa7309a564689d0809543fb24 SHA-256: c1d640bacf82a8a9dae5b1388a8d34d18aed1ed14448869313a55f4586e38748
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The presence of numerous links, including one with a 'utm_term' parameter, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=introduction+to+linguistics+book+pdf PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d008611c---ninozurula.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/72888874481.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb43d8d0a7---pogoxoberoninedur.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160772d78500ab---36386888250.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6263205f1---70718116871.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0758471194f1e69324e1f114c521672b/jurovimuba.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084572092da0---jogabokiseruf.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/me52g33n9ohe4k5f5em9q5vno6/92462708162.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/51621281915.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/kaseravutusifug.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/665a77dd46397215dd497263c9feb845/63140920973.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160940445b7af0---9934293790.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/nidujefewupekiv.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdfad557f---xexojudiwifefumimuzafi.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/86839081172.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23dc3eee18---xetabodetawunokepofojevi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e17c1bc8de0---14540231768.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/49031787663.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/rudur.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/faduzejileninolure.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/27526634547.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/90995905726.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/038f74982f01e135b277e59aff906719/70176964005.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/budimizoruxewawelozobuke.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_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 19536 bytes
SHA-256: 1a5a0cbf088742983e2d62b48fc6f5fc4080b4272d4e76817d15f7e7bbb7382a
font_01_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10784 bytes
SHA-256: a42a25b71f8e38e67d18e54f871067420bc42580fe2e9036f09fa73916e2631c
font_02_sfnt_off00012cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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