Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c12c41539e6aab…

MALICIOUS

PDF

67.2 KB Created: 2021-09-30 16:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e6cc23f41e859c7874c3ad0c2e408503 SHA-1: 671dc0bf1e9ed16f86f6726810f8c74a60951631 SHA-256: 83c12c41539e6aaba2c6dc2642916f1692f2b6075b8932c347898d1e38af1558
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings strongly indicate a phishing or credential harvesting attempt.

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 https://irlanc.ru/uplcv?utm_term=win7+home+basic+32+bit PDF link annotation
    • https://securitydm.rs/slicice/file/tumora.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/pemusinuzopikatusizova.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/26119726126.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109291650157867.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/sedigutoxivetod.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/63728274116.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/fifiwidazakogofavolo.pdfIn PDF document text
    • https://go2germany.ru/files/file/75952484336.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/20490860087.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/21969088323.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210922171417.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/xutiterupuzebetujod.pdfIn PDF document text
    • http://fgosvo.ru/files/files/34458291885.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/90248856827.pdfIn PDF document text
    • https://il-gusto.com/images/file/21934345002.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5982b6a5---62700606889.pdfIn PDF document text
    • http://ndt-ultratech.com/files/64269863478.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146fb6aca3c1---3103255046.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/89266140508.pdfIn PDF document text
    • http://prosquash.by/data/vopezowezetufuwuxadod.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/20e8e81255c43e90a4c97c82e9b0c711/50506170159.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tokapewafivinobobawes.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/35293972035.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_off0000abc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC1 13840 bytes
SHA-256: 51e45a53c30bc65957483da18dffeda21f10c98032c5019ddb2c77e87dcb55ac
font_01_sfnt_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 10824 bytes
SHA-256: 1c13ff5b6fc705865950f42fbd98376db69c65a3edaa6466ce44bda172c50c6b
font_02_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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