Malicious PDF — malware analysis report

Static analysis result for SHA-256 0886cb6fe32323db…

MALICIOUS

PDF

173.5 KB Created: 2021-06-26 20:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e9b651180dd1bcbdf858d30164a6f47 SHA-1: ffc5d38e11d71ea0bccdc8afd25a720fff6bb157 SHA-256: 0886cb6fe32323db0dfd9d16a55d943d0af1e231cd467ac8441967c64900a35e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is sufficient evidence of malicious activity.

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://dacinsara.ro/fckfiles/file/96317124464.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac133150334---50102648211.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4bdb6cf77917550fe124fc2d9c4141c0/zivovozaguw.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/vuzufaru.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af91a8e08d---vizugetesipiwalowemivumo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mucfp6jbue1mvkgpjd54krn9oa/69017181094.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/walawan.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/be56f9851d321dbdbef99f9da68c1688/jerer.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/izogakusidivivosozame.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/52296438008.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3b667a60f208344de32a7c8039d7c075/21763156266.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210621081650.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd4ff28bc---punumaletun.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea8468b77e---38012545672.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/58912255983.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1436ebf316461bb3a82f8d323fb0c28c/79753271002.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o3cebu3j3dmlm6gdgmqlnm20lv/rudivamuviravukol.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/360321c37f5dc1fb1f0f124dfd50321c/86357706949.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/19628838395.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c66d1732f---90110383792.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b694a2f8---74050827603.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/50757757179.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2484c775a---xejulizexoxelasixuzeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=naval+architecture+coursesPDF 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_off00024d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D91 10364 bytes
SHA-256: 0b82460d6d000b970e52b7655248ad17c2b14c24ea719f9a6171af4168d096e1
font_01_sfnt_off0002652c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2652C 16628 bytes
SHA-256: d08c114d2ad0b52a2a5496574a590d58c38120a7fdfd5985752734e307f2a96a
font_02_sfnt_off00029015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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