Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68ee531f4ec50e2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 12:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e02488564cdf6b633aa252f53ea6285c SHA-1: 807d9297febcfaf3eba811da8cd0afc4e5b1af16 SHA-256: f68ee531f4ec50e27e5078e27cd65bc561ab150841d07600e2e091f2ae2731e2
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of embedded URLs, many of which are hosted on disposable domains or point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=android+4+4 PDF link annotation
    • http://hycxchina.com/filespath/files/20210912185850.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/vuwirifedidanif.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/38c623b99597178a3e7913f0c0536ae7/90917651903.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cf2dadb5---75876748644.pdfIn PDF document text
    • http://weldingplaza.com/files/file/46765581315.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91330647184.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/dowarokagamevejirarepozix.pdfIn PDF document text
    • https://cargobull.cz/res/file/defimudufunazi.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/xilegupafebijojiremomuj.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/46770678323.pdfIn PDF document text
    • http://synphabase.ch/upload/file/74672358984.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/9132412105.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/75447225082.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/vukevagadokosaniv.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140af5111e9f---38020995489.pdfIn PDF document text
    • http://ropesadventure.com/d/files/dodonumanakomuvekovi.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/ralunogu.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/dujaxotebotobobupir.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140da510c173---kupikidelejaguva.pdfIn PDF document text
    • http://capital96.com/userfiles/file/97484816312.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16304551977feac573fdaafa6dcede.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/galusidap.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/40903907483.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_212139.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/52467789068.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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 9692 bytes
SHA-256: 8bcad42eb797e104493773530155d67a24fb6d6adbf4961d67f1c5d9a4d8d052
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 17296 bytes
SHA-256: 1e6a46e8eb0d8a3877238cda0e39aaf95f8bbe685da56682603c622775951322