Malicious PDF — malware analysis report

Static analysis result for SHA-256 70456e7eab6e038f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 21:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f9f25324fc6b95d1f5751540a4bf641 SHA-1: 84766a562f2986ce135664e873b1ae4930276ba7 SHA-256: 70456e7eab6e038fcaa7008eadc72ac1d7ce09281ad156b68b3cd3cd03dda748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=premium+play+android+apk PDF link annotation
    • https://binhvi.com/upload/files/70197570015.pdfIn PDF document text
    • http://generaldistco.com/images/file/21200153296.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091206142773499.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4393e15d27073dd2ffd3938a0744da88/gubilurodibi.pdfIn PDF document text
    • http://matras-devison.com/upload/file/pomifefawe.pdfIn PDF document text
    • http://epicridesnepal.com/files/tivatobavasusewufuwovezo.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/56493261363.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/45037817037.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405a2460f91---30680246402.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/fojalivifowobaxepotuvujij.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/45683617007.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/73359928835.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1meodq9dkl4tidj8hrj0n7q5jh/viwere.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/bumenerirumoridaxup.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/59133175022.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/bezigonuniseluzab.pdfIn PDF document text
    • http://recrute.fr/files/files/kiguxedaworivi.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/19462631014.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/dixeberevel.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/20888507471.pdfIn PDF document text
    • http://www.moyekolodin.com/files/boposabowamafugu.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/96956653314.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/16868045502.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 17848 bytes
SHA-256: b8c3b7ce31af2265951e6c866d486fb2fb504c20384cb3baa676c68054092f37
font_01_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 10596 bytes
SHA-256: 15f5c0846be1d2336d279411fbceab4a17c1600b2dd54cc89d14116c96eb9de0

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