Malicious PDF — malware analysis report

Static analysis result for SHA-256 765edd81e0fec7b9…

MALICIOUS

PDF

84.5 KB Created: 2021-07-18 22:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 603f01cdde884e972af4ab5f7529fe80 SHA-1: cac9b055c5be7559f6fb646d77a6900931cd7b2f SHA-256: 765edd81e0fec7b9ff2dcc19324277e37a8489666378772d53515886d8a99f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nadamasristorante.it/file/54459048446.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f7da53a7---66260926171.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd9e4c013---gigivobifatonazawume.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c13117f7---37810187799.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4hb8v3hn4use3kp3ipf52hl3bi/jebubajapabixixadad.pdf
    • http://shqinze.net/admin/upimg/file///kurexulal.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f848f855---27058306741.pdf
    • http://angelescare.com/userfiles/file/24603906245.pdf
    • http://zabradli-znerezu.cz/userfiles/file/bovutov.pdf
    • http://hzjksj.com/images/upload/File/10161837444.pdf
    • https://cottonweb.net/userfiles/file/kesozagugukojoko.pdf
    • http://meteosputnik.ru/userfiles/file/tamegajuvukagot.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2900c8fd---21760964107.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/72835036475.pdf
    • http://yuanyoujie.vip/userfiles/file/mofizilubole.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8ae8b300ebf4ebb1c94c9f2be3b753b9/meragitovogi.pdf
    • https://angkortaxiservice.com/userfiles/file/59122732770.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/50944449568.pdf
    • http://www.anclupnapoli.it/userfiles/file/wokus.pdf
    • https://sgcaregiver.org/contents/files/pizivi.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2a6b106afc4b045c6148d8b5798817e3/zetedimemifajeboxabifet.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/qp6iqbh3eamdhv28rcc5f4msc4/musiwononimapavo.pdf
    • http://csc-0898.com/userfiles/file/20210702162907_abmm6b.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/450926e677062f5efec5c90a6249a540/pevadejanovusosevaxat.pdf
    • http://impex-italia.it/userfiles/files/98482385948.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chocolate+village+by+the+river+maribor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e345.bin
dbf8333c324655b2d3b00e37d1c9c95601891a9745c4a5cb88fe1dac08b480bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 18676 bytes
font_01_sfnt_off00011395.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 16792 bytes
font_02_sfnt_off00012bac.bin
05708bdf7ae7d02173d6be13db7da7b801ebe285f0debfe1f27ba2d9337260d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10756 bytes