Malicious PDF — malware analysis report

Static analysis result for SHA-256 7878c0d6915c8a99…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 07:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ff2ca66f1ca51ee837df77d150059e4 SHA-1: 90cd4a9aff5d6fa62f8a25807fcba12814fb4483 SHA-256: 7878c0d6915c8a995b552bde59d759836ef2a459f54ed4b9243fdb79aa02162d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. These links likely serve as a lure to download further malicious content, potentially exploiting vulnerabilities or delivering phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=idiomatic+expression+for+happy PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7992170ffb---darirabapivoros.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bc74ff73ac4180841e575ae453dace4c/potixojurijanotimamuje.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/58687014354.pdfIn PDF document text
    • https://latework.cz/soubory/wojavikiwufudowezijolub.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79a39c9029---kumesuvuwominegekogomi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076111f405e0---81211434811.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/30733888045.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pibulepazefo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/eca6b778ef79879414b022a851d2c5ae/34199284863.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vig2u19g6se1hkpg81o4nu2gc6/37993105135.pdfIn PDF document text
    • http://jarosi.hu/files/file/gefakojenulonil.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/11db3bc95b8df541cded2e0bbe9d32e3/pupibasibepozise.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/35107698883.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9qshj7l6iikh3itnmp7bc7fm5b/49807794060.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be327a85f0b---rududelusajovimosi.pdfIn PDF document text
    • https://lasanisports.com/files/bogaweva.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749a095c8d1---97528764554.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160afa921c6f55---15957979294.pdfPDF link annotation
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e7qoqo5la7d1eomn02d976ri97/40425789408.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/60185255185.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/46428569590.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f14689e90---xeximupavus.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/85801296620.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o0bghf0eaf25o9vdmk7kqr07a1/femijalunij.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17c65ae4b---35637527392.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_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 17192 bytes
SHA-256: 30f6919a6b63111c5c9ad6bf140874cc429677c2e8174b9851a1cb92eb6581e9
font_01_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 11004 bytes
SHA-256: 8d7d55d122222e07778c0d61117ca691139848891a6b8f5f4f58ef8e84ce13fe

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