Malicious PDF — malware analysis report

Static analysis result for SHA-256 10da82ec794b40bf…

MALICIOUS

PDF

67.7 KB Created: 2021-10-09 07:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 38e3ddf6abbb12a01bd6bb552b84a3b4 SHA-1: 0dd61cbdda57fbe7e5364aa2eb279f7858dc16f8 SHA-256: 10da82ec794b40bfbc90793ff8665bb9dd99c3c81e004399792e666dc49afc63
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, which includes an image-only presentation and embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised CMS uploads and disposable hosting suggests a campaign to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://copy-office.it/userfiles/file/59744175951.pdf In PDF document text
    • https://hotelgaric.com/upload/datoteke/92060049095.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/vijariterojiziv.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/vebuwasimupekexite.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bowobezedigoj.pdfIn PDF document text
    • http://fnathservices.com/upload/file/14683283184.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/firipusalonika.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/serizawikevijavunuduj.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/wuvirasiboguxudoxupol.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/94768188281.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c990bc57f4---daliviwezaxuzegufo.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/99216287979.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1140a571f6313658a11a078649323e28/82068373273.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/57469088547.pdfIn PDF document text
    • https://techlan.pl/files/file/xorilenexoworituzixuxepov.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/76692482624.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/66464855883.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/61871856050.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d1e742244d07cd9e4a47e1ae01bea7f5/81968522130.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sagexewataxibatefijaxan.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/72478454061.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/luvafebukev.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/jafenito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=most+expensive+collegesPDF 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_off0000aef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF1 14016 bytes
SHA-256: e08063b326188b5a0c43a958c0c1d28e8ea1a73691e2ea6d98516242ee54c9f4
font_01_sfnt_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 10448 bytes
SHA-256: 49d6f8459c7fe0c7b9f38ac56ea871d2c4c3c1871e01ac0306cd164f3d61b288
font_02_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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