Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84cc3fe0485e712…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 23:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe5a49d7c65bac64f6814fad74b5c871 SHA-1: e5bd32538e3a1699c5764452ee8033f406a4fde5 SHA-256: a84cc3fe0485e712c24e70787590f53de44108f6cbb4c340c7243f141823b184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=howl%27s+moving+castle+sheet+music+pdf PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d183adccf---xavixoseridegavirajina.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/zojisojejapabomu.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/tupukepogorofutiliwixika.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/retixojatanadovepewaxu.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/kosolumobekotevof.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/rosexalufogonojukasaj.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/rofadaxisojonojimoxal.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/rutuziju.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/bejulurire.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/dozoborote.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/sororeresileberafizezivu.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/95004850903.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/5935969264.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/3488653615.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c4b57200---tevarofog.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/44744418875.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/fefitikodugegitosekogovij.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/97974199118.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/faloz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1314ec4fd8cfac7826652767673d3e36/nujuserawagesulejel.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/25893187831.pdfIn PDF document text
    • https://jurad.eu/files/file/47049695494.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/21423410124.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_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 19852 bytes
SHA-256: 37a5fdd0d00cabdfb9652b6883def64b3fc0661bc71574e9de93a022f9d01878
font_02_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 11244 bytes
SHA-256: e13b4d00e41571cf90d09ec72dff6af4699ab1fd52863f14169db13101ef45e6