Malicious PDF — malware analysis report

Static analysis result for SHA-256 0439254d0b8185e0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 18:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 429c9ac810496dd2e94cf4c67abc39d6 SHA-1: f2a85525dc712b647965dac3a66ea388c2fa293e SHA-256: 0439254d0b8185e09b8e07556e039be01e297b44fb74b02d003bb1092698ba46
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to distribute further malware or phishing content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive content, potentially leading to client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613877fbabf26---49689487954.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gnhsbpors6l74rbi5o67idf6q8/8454343907.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/13850713223.pdf
    • http://vce34.ru/attachments/file/zojokeroxamupabozukivopix.pdf
    • https://pasarangroup1.com/contents/files/28066657545.pdf
    • http://ulrike-mayer.de/userfiles/files/lomewapilipaviliguje.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/julojanitabakop.pdf
    • http://lsphc.com/userfiles/file///55594988866.pdf
    • https://ingatlansos.hu/images/userfiles/file/25363118655.pdf
    • http://mobilahomedesign.com/userfiles/files/92092840205.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5f459d883---42175335090.pdf
    • http://wellfoto.cz/pictures/files/xozakibenunabup.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/23770df3848cb1b067731ba766cc194a/rijexazepapinaxitobiguk.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/88bc06133f940e851e2ef16b0203d06b/dalinadazuzu.pdf
    • http://lg-palette.com/upload/files/vexapodifi.pdf
    • http://eikenhorstgroep.nl/userfiles/file/77060358644.pdf
    • https://digireg.se/upload/batasuduxefazetumanoki.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/32615321207.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/mubovapozofipanajerirofol.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613278920950b---dazejana.pdf
    • http://apicn.net/upload/files/78109725471.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/kinarofagurenagutimu.pdf
    • http://exmar.it/foto_fck/file/fazuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=excel+tutorial+bangla+pdf
    • 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_off0000b930.bin
57fce313eb523f98e3bea0f2814823acaaa9c4ab9a33a80a428eec0a389f0060
pdf-font-stream PDF embedded font (sfnt) at offset 0xB930 10952 bytes
font_01_sfnt_off0000d244.bin
46cdcb1123b33e111249034b3bfcb262fb72a5da00b92a4b7b8403ac4302104a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 17920 bytes
font_02_sfnt_off0001006d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 16792 bytes