Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace15738abe389be…

MALICIOUS

PDF

89.8 KB Created: 2021-08-18 18:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0305928d73d4e6fcd291ee349051111 SHA-1: 4983f45e202798009ea89cafaa24fb3aac2cda93 SHA-256: ace15738abe389be49a87715fb0d30b6d8a5f3bceac0e7177e9c8643c10ac280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests an attempt to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=peaky+blinders+season+5+download+google+drive
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074682bd3ecb---58555312073.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e88889e2c51bff8e65a39e853f270f0e/dawarir.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede80cef18---tinopudurukisogekuraw.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/771ad74e0f7b058e8e538b25eb706daf/4360265021.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc6975af9abdf42eb6b0cbbff7fa52c7/99975939103.pdf
    • http://goraku-sangyo.com/userfiles/file/tozaw.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/bigolej.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf50ce4a76---38288631178.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/rewedofenipeduvanagirurap.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56ac4643c---74335580929.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/52c17120dec186090a78aabf9b66bb72/21588149280.pdf
    • https://krassimirtaskov.com/userfiles/files/48045517664.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f6b90a0afb6320f18d8e73fe267932dc/jofimunuveviza.pdf
    • http://ahlhy.com/uploads/file/030622216598.pdf
    • http://bselink.com/userfiles/file/nemewemekuripapafemajib.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2507a0c064---72622639946.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/61ff5d1c910e67a44b47e5a790a1ff90/totagon.pdf
    • http://solee.cn/ckfinder/userfiles/files/xikofod.pdf
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/92679932637.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffca18ce4---tagesabapezodifa.pdf
    • https://asthasupermarket.com/userfiles/file/bebomotowopi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c9fa7fad---zuzalufujib.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b171cc468aa---59586186953.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_off0000f595.bin
66927979d35be49e9abe40fa5f208ab0de24f186e68053391464b169a6285f03
pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 18356 bytes
font_01_sfnt_off000125dc.bin
c06a171b3285d18f6fe076f935ade830fa9ff83df8312c55324508b49bf6888a
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 10956 bytes
font_02_sfnt_off00013f47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F47 16792 bytes