Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4bb2394f9b0132…

MALICIOUS

PDF

119.8 KB Created: 2021-09-01 08:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71b574fa9c82a6b25d26d897a4768a0f SHA-1: defe98a69f95290b0da92b025dd98f13fbc13bf9 SHA-256: ae4bb2394f9b01328287c08c6b549f18e63c076c17dfdbf947453a25119328cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://laborke.ru/uplcv?utm_term=regarder+once+upon+a+time+saison+7 PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b068672f562---wekofelikud.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xisonajeratoxanurejufenud.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a03e05d45cadc554e9e06c5e431aff46/giretekesoti.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160952f9b90730---muvosuwugixelutuzad.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909171b3db0---51193974348.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/74975243753.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2ee517c8c07ba636b6a8b8571d9fc5e9/78270692905.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/92638101787.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/24557021645.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39730dbbfb---nalidafexide.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/4480622260.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f3e36ec531cccdf4474a9cfabf513d1a/nuwujeloluzibesexivab.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725c4027271---debikiv.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/91c6242007207daa42e9a47e5de244f2/nojufemekes.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/51473014029.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/2887655410.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161205f3c48d99---kupos.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/f1949b5d45d3c6f9e682ae06b489f430/wividorajox.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/lagogikakasodijog.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/nagufavamibufuxi.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/70999010822.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/65935545004.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d230bc5c3010a21ee224b76f81524dd5/28992615978.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_off00016881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16881 21456 bytes
SHA-256: 5a521affa7877d6dd9671139a2b418d51096a1b5ae822208613c896040234a9f
font_01_sfnt_off00019ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B80A 11008 bytes
SHA-256: ff55bdf4c4e8a83ed519833b59a8256f4677433740f43454d0b4387d3bd8b427

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