Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c7468752ded984…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 20:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 89770d143429f63699feefd014c78241 SHA-1: 4885e592e8bc879a6f671eb3f500a40e2f14270b SHA-256: 42c7468752ded98411bd66b3060b2d0a1e4a4395afdc3f5404efda8d873501e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other external domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links strongly implies the PDF's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=2020+app+lock PDF link annotation
    • https://lederstuhlshop.de/ckfinder/userfiles/files/nonuponikowexepuderif.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/66273194333.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xezufevozowogeba.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/fovafuvafaj.pdfIn PDF document text
    • http://thaide.org/userfiles/file/72620951517.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60455ed86---84377776203.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/diful.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/48d4101b47acb6045d6620fe4827b267/nofefeg.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/82bacf50fff3bfa73b4a278f3d14bb67/70937186768.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/wakutivogizixabum.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2099684bb490fa9e118551312f518086/texoz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94b0be011---migapepulaneribe.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109021008173815.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a0b1c296---6429748592.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/ronego.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/tulibitadigebul.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/zarirefefofevowogip.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/19732143652.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b367ae64ad008765801a801eab913897/83225195900.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tijuxuvopijefawajosepef.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/76922388107.pdfIn PDF document text
    • http://smirna.pl/files/file/rovitifedetifopujiba.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca793b64e2---vunarogidigagip.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/wupuvijevudarogikepepe.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/93091244870.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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 17296 bytes
SHA-256: 837fc5e5d3edde5b2845430029dae8c88489fb8c2ef346d30826ae61576de026
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 9912 bytes
SHA-256: 5adc184d023518922d5077c3801f818978a7298c76bae38567e05f7d14c9fcc5

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