Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7559cb0d11752cb…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 10:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a98dfa14a0f2ea7ea6a8fcaba93c7f97 SHA-1: 583f0c7bf3c33c24b86c328dd6afca79f4e90b01 SHA-256: b7559cb0d11752cb0eb206a51dec4c102c415d991487bcf8e5285223ef7aba25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=management+science+pdf+solutions PDF link annotation
    • http://eros-arena-reutlingen.de/eros/userfiles/file/lovapuzoradofeluwixuto.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/diloruv.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d938a9dbaa1---pinixiso.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/kj0kg1ggbj83h0ro2t7ocmospe/3675768442.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/medibuge.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/wawikepavu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9ff470d9---voluluf.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/54418296724.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/61961724903.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26bfb9dbf---24437728506.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/62597526201.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e261c103---lavofimuvixubovojuvilibe.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/85750189032.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/xigeb.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/fuxofozajewapun.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/22320444154.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dfc252b7a905a179803b1fa414e412ea/49801618872.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/wabiriputewigubovonejazex.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a14cc004c8ba42460a89121b7065170a/degavo.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/pajavulolawasinew.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fipifolado.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_off0000b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 10956 bytes
SHA-256: de2cd9107909c77914d353bcee42e84030e7ea218a36e24d4ba86b3a1aa19319
font_02_sfnt_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 15416 bytes
SHA-256: 02fcc3cb67e63dd5937ff5b73bfb0f0ea494b2a864757a7178991e35c33e099d