Malicious PDF — malware analysis report

Static analysis result for SHA-256 2016f01564e6039b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 20:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa4ae5571e7d192a577de0b1d5ff3e7f SHA-1: 65746c31dfa09c22bd6e0d06114a605c259dbf3f SHA-256: 2016f01564e6039b284bd609321f3b37a0f35924924f7b5339d8ccbeb3f128d1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://cancunday.com/travela/img/files/51280391746.pdf In PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/miwalize.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/pumumodamuxam.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/nasiruzafapixawavuwewux.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/tateliwaxaxuzujugepeboper.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fcf6537cc---kefaziwaf.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/be0826212a62516a6c24f87efbf6f999/guriworixadutaz.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/luxemeviruxu.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/duvefilogefaluxapanobuxi.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/fasarumi.pdfIn PDF document text
    • http://df-2.de/images/daten/file/gazubom.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3a04f1d1899bf25d956728babeafd2af/jimikimefipewoguw.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/romotukutawususizid.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/89860236093.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/13477356525.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/79047022067.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/60095227829.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kazokisifupuno.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/26282721093.pdfIn PDF document text
    • http://sswjeans.com/files/zitivem.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/vukubugusurojerifuvi.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/gimoliforeseneda.pdfIn PDF document text
    • http://hasyo.net/files/file/famulo.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/tadifelaful.pdfIn PDF document text
    • https://hiroyoung.com/data/files/69736768846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hacked+dream+league+19PDF 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_off0000bd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 10532 bytes
SHA-256: 41c65a9f476ec4f0c449358c23170a3bcf5e9f2db5ae2ebc48925ed4f8dcc72a
font_02_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 17660 bytes
SHA-256: 3870d3a683850f03e47758baa96e9424f56259566a4f3db53131f6f27aa749ba

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