Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88027448c85874b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 14:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8779def3d8f33ad3d609eacbab4a7519 SHA-1: 21f52275db939c26865ee789b2d484def62e1a6c SHA-256: a88027448c85874b9914a811b825c5edf50f27c8c8c2ce4e4beacd7d27a6b5f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, many hosted on compromised WordPress sites, suggesting a lure to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://studiomedicoveterinariobellucci.eu/userfiles/files/88325428867.pdf In PDF document text
    • http://linuxnewyork.com/draft/media//32294749386.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/ximaxuzunujejixenuruv.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/20707e13278392651dbf283afce155a9/liregodufojisudovepe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d072cb0e29d---79373320346.pdfIn PDF document text
    • https://tomas-music.com/contents//files/27175611634.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mdq1ocbven8hcnt4jqvq56ougg/82212287228.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ce9e328e---pidonegixusuboput.pdfIn PDF document text
    • https://marigabung.com/contents//files/45487354138.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/verefomufenu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/93ee37524b86982c9c2c038cbb7b73b6/45113995131.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210829_8EBD350BB284B762.pdfIn PDF document text
    • http://synergyproperty.com/images/files/rusedaginunuxa.pdfIn PDF document text
    • http://hydrem.ru/images/file/geragoxi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090472949c3f---xejudozowitipalekox.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/44968418596.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/sirerum.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5b68b3e53d4719455f76b39eaf6b4c4b/dutuv.pdfIn PDF document text
    • http://airsoft1.ro/files/file/fiwoledegeseguwazepon.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075557888ff3---3800822873.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/wemiwegolubumujajo.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/23236979967.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vr161a5g5helgg63ljtnrdodq3/95278644780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=2017+buick+encore+owner%27s+manualPDF 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_off0000ba69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 10992 bytes
SHA-256: d7555fef5dfaf2a5e091c3e044366fab80b4ef60e57e1b49ca5dd6027e5b4fec
font_02_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 17380 bytes
SHA-256: 3fe951f89883f545aa8a7e537401f6b51d41ed5235d81447ddae3236be5b9cfc

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