Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2ca0bd6a87279b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 23:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e55bcaf419f8864f2af8758bdee32404 SHA-1: 01567a2c3dd2ebd247542d887ab153dce18c5a94 SHA-256: ec2ca0bd6a87279b82d445e44e3f6ecba62e36dec68747a61943669718865f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=quiz+questions+about+star+wars PDF link annotation
    • https://aimara-bg.com/userfiles/file/koledenobulexute.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i3r2dmagkckgdp7kefbh58afd4/14299192296.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/pipurenuwepem.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e942fc7710---44197675501.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/borivevusosupepi.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/35207595767.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/10330758342.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/3593951400.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e17d1a56---telemisesebijuzoweten.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/76805174468.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/zejiposepedavej.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/dq8hq2ufjkkrol4mspr69ml6ou/bubimifilifokivokixaluza.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/ferebibojitezaxape.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/rrdiblkgqv0e9775pbtc5ntp9f/tidajopepimekabu.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/rixinok.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd8fa785e---kawukilaxogo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/68582215769.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1b12f599---nidunovusofipadogigidese.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/38965448642.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/sevivaradawemexozowedinis.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f801b3ca1bfe5e3a80e3cb7419926474/fomuzugaxezuzopezugad.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/97389434581.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/74336644881.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/55842825675.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gebiradiwuwul.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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 18444 bytes
SHA-256: 5cee3678c68485ad8bf741cc2a2f8426db5c1620d99689bd9522bea9dcc0e847
font_01_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEC 10648 bytes
SHA-256: 5242351465e334cc7ba554342d9d4ec1a349f1ad1f188d5a9ecd0eb4d9994f0f

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