Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a1634f13764b93…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 00:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f809c6bd6c9f3ebb4b2fa3d81933bb2 SHA-1: 2cc4f27738121cfc587b1218c2c1b7cedeaf4a34 SHA-256: e5a1634f13764b93fbb496f3fe905e5a5d5af7034f283808494cbedb78035823
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The primary goal appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://peknanevesta.sk/media/file/41164006471.pdf In PDF document text
    • http://maiodi.com/userfiles/files/xolitekomotewadusomu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-10/20210910192654271318.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/82198337641.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8k0509u8ov5f2fmkhhfh9hsv0o/35102835392.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/25088996180.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/45201807645.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350919891ab---rotixozavorezomijodo.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/nifafudakonuzesin.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/lopusuxujawa.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/30064055946.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/mavafuzakivogexetukosavag.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/97234434678.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354eaa4ac65---wagog.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/83808870778.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/10859508432.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/netakoxawabagup.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/mabigeviwam.pdfIn PDF document text
    • http://fohow77.ru/upload/file/48552797076.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/12504125312.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d6723214---23726868135.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/zotasaxiz.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/28721189399.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/dodavinibulifuxejawekew.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/6315839328.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d638fb33df---76070217580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+mobile+hack+ios+no+jailbreak+2020+freePDF 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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 18508 bytes
SHA-256: 7fe92e250105b42b464b8cd2202ce74eb7e8dfd1cdcb29b83a97e4c0be1c26a9
font_01_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 11392 bytes
SHA-256: 6aa1832df8f041c8a313094667e8e55a318e62a0abb385d42666e12c600d756c
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1