Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31be9deff8c15c8…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 10:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43be5f8265f5030e53457774b732528f SHA-1: 1cf4082ec78bf4815187892a0a9ac71e2d450534 SHA-256: a31be9deff8c15c8be9b8c73c110637e77f644512e71124e94f229c52ef9458a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pistant.ru/uplcv?utm_term=convert+pdf+ke+jpg+free+download PDF link annotation
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/tigaxowobevixitovidalegan.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/qt03ioje2hna26ogcochoivruk/wirujuvuvefenomudojixi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b693edc5d---fuwaneniwuxekumobudase.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00jt0hc3pbmi2su7ls1c1g7ar4/37899803170.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/90849450677.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/5c022e5b40e8b67730527d1bd9863378/28178386073.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uujfokuemq7ia3k4796nupstvo/26928395043.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d574d199b7767931123cd55c4c80a972/jigixupilopegosimawi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ad3e7ccf3---polefopuki.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/bosawuxezokojumijuxit.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/mebegexab.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8312c2c04---dadajoxagujuzidowazibutok.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094c65925b39---61803965816.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/tafuwojoriviziv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1a04f838---34041957265.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/memalumajixoridizejazuzun.pdfIn PDF document text
    • http://salkim.com/userfiles/file/bifirewotewulofezus.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/761882c9d3ababce15c3b698c08162a2/jekebezusex.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0sbjp1gu0smkue3aci45tc5tdp/vuvimaze.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c2605ab34ebda36b7c1adf2fb036155e/lerinasukagelikoto.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/vinetutokipixuwojerola.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/gosunofetepafipanofupa.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3046579ea4---zudubarixazo.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/63164461263.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_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 22464 bytes
SHA-256: 520280ae73fd423e6f7a13543b969c572c2abd813eddd78fafb71cc4622d918a
font_01_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 10820 bytes
SHA-256: 3970e344c111386498bf6e69531513e847ecb03f638d7ccb4d2d2006b17ac0ee
font_03_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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