Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f63ba406c0c0b57…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 03:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ffe2fdd639e7a1ed831ed7905693264 SHA-1: 21ffe45b1a66df10dca271c1a3d981982daa81eb SHA-256: 1f63ba406c0c0b57a46af0a3a2ad3756701a7d510ca71cef5e680ed425a4cca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://4x4autok.hu/userfiles/files/lidusuvikokuwa.pdf In PDF document text
    • https://angelsstaff.com/uploads/file/xakulomowovamagaler.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/xevaxosugaxevowevarut.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/64273352630.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3a38e618---24844905847.pdfIn PDF document text
    • http://beiks.info/public/file/sererurogo.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/24811679132.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b366bc83bab---61235792611.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/ub1ujndru33jcqirdue5v9km42/tofabebujelu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d43fd4b94---kexusekavejuzogerupav.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b0389ddab---nepijidakotebol.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/43196080884.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/kitogipimeguzinisilo.pdfIn PDF document text
    • https://anfauglir.com/images/file/zupavesopaje.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/73218301070.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe079caf92---povosalosuwa.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/wuwiwiweruvigazubazunajo.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/86847535975.pdfIn PDF document text
    • http://etkenkalip.com/CodeignterProject/vizyon/files/lokaxizajawonozeru.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/56182982183.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/wifiwekutuwadodosokarevu.pdfIn PDF document text
    • http://bscartridge.com/pic/sawizaligazeruborunupo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca8c251b2---bosajixin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=it%27s+all+i+ever+askPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 20212 bytes
SHA-256: 6601b696ad8ed5f87c7620f119958bbbba44bec735f574adb703061c2235afe3
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 10020 bytes
SHA-256: 3307c75ec1f436d60d09c2411f89971d7d6de521151008057461066a283fcfe4
font_03_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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