Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e0e3a9f236e325…

MALICIOUS

PDF

91.4 KB Created: 2021-08-21 12:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ef1d1e71c830b17e0ec8669a906da17 SHA-1: 78072bc0035808da1fb9bd038fd5ed56d13ce55e SHA-256: a5e0e3a9f236e325b91eee3e873a9a89345edb4fa4749f7f8c2508cd05066520
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to exploit users by directing them to malicious content.

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://krisoc.ru/uplcv?utm_term=driver+booster+key+pro+2020 PDF link annotation
    • http://afghansolar.com/userfiles/file/30233961547.pdfIn PDF document text
    • http://absigorta.com/E/file/joxet.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/pakeregegovebufos.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/wobufux.pdfIn PDF document text
    • http://cartopack.be/Images/file/93471916551.pdfIn PDF document text
    • http://opersan.com/file/83305347594.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7519b0fa83---peniguwobudufebezebasewog.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/kinaketuse.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b9734b90d---83251930413.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdce06d68d---nemiwegebarisunenefuti.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/77752512737.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/8204419039.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/50c0c21ed2d3d82aca91ed287e5f3227/67068018762.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rapigip.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/7478022576.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/dulebofilukukijagofuxa.pdfIn PDF document text
    • http://cke.hk/userfiles/sanikul.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/dab96ad632d4c7fad1b694ff205470f5/tezuvadeb.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/32085970885.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4ac59617e91e5bb830344484a79f294c/furutukuw.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/37126454328.pdfIn PDF document text
    • http://josquin-capella.de/download/94598988403.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 17688 bytes
SHA-256: 5d9014cde1af3ab181ca7ec11cc1332e235498d8eebd493236d84857b4ca8c7c
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 10588 bytes
SHA-256: 43ffeb368c7c42b3f48e04839f3ce7d204b99a8285fbb5b6e3aff9e1d92566f0
font_02_sfnt_off00013058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00014663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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