Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82e33d0e1d38973…

MALICIOUS

PDF

98.3 KB Created: 2021-09-06 09:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6da1796e6d41d85d63f8e445c8caff64 SHA-1: 4d9db075d90ebce861f069da87cb43c0204a4d8e SHA-256: a82e33d0e1d38973b95550bf74ee4c5b935a9335e81f495a44ed6bea8d1e0a9a
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 URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tuclubcr.com/campannas/file/79472053253.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sonebiwuv.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/sugiboduzoridagaz.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/bipuxa.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9d6856d8dbf36295cd9842f02dab49e1/9197023176.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/871grg089iaq2tip32ifg1468q/31158036637.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/02b0c769jetaeds7uslc4a7iae/48783653297.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/56j5gune8ahet26skkusn2hqo5/97938364905.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/72918092611.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jesaxebalotapowegokomi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b11b699a5---tolijawuzis.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/sekoxavenifikugeno.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/92705562946.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4886f5df---vopunosaku.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0eos402ijblvtpaar8383tmpf1/94146109083.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acfc523fb---xisaxebederipunuvage.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/66427012521.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/92719767434.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/tosuxexeruvimo.pdfIn PDF document text
    • http://www.puhito.hu/uploads/19865288211.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fpnpa36lj7ekpdno1ka00029oi/zipidekulemat.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/ruxonijufifopemobuz.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/mupozofemujotekunelor.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aa3ae8202c4fc7a8d533ac59306bdc67/fitifoweta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+metamorphosis+pdfPDF 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_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 18888 bytes
SHA-256: 04beb5524495c688c373465d3a0e529519009a5939c148e0e946bde0cd244411
font_02_sfnt_off0001636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636E 10576 bytes
SHA-256: bb708165ed7688e7c034d87b6fbecd4f5b66c98b732d24546ef25bacb674b152