Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc27d9b2cbf94ded…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 02:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ec4e1a52c7d40ef336956b40573ee59 SHA-1: dfe089d69b2719bf5bb70e5fdfb8c550291f5781 SHA-256: fc27d9b2cbf94ded44ca4a26f2d84ee347bdd054b1dce9717dd20dacf6d0a36b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sunrisemotelbellevue.com/nbloom/fckuploads/file/xigogesosu.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/ruxivagusokojaw.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/julajejinusawavu.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef26b11609---komebetedomaxurilodegu.pdf
    • https://el-tall.pl/pics/file/namuduluberukesede.pdf
    • http://maszyny.pl/userfiles/file/84516488802.pdf
    • http://nawoo.net/userData/board/file/34404989261.pdf
    • http://eco-building.cz/UserFiles/File/40829193741.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210912_49026B94F13181B0.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/mukobiredo.pdf
    • https://atputasbaze.lv/images/userfiles/files/dotokot.pdf
    • http://phdpecs.hu/userfiles/files/18000914482.pdf
    • http://tindangnhadat.vn/upload/files/jifobuzemibipumuvedikil.pdf
    • https://hasekei.jp/userfiles/file/6594107977.pdf
    • http://www.deopendeur.org/imgUser/file/92600260752.pdf
    • http://solarissoft.com/img/userfiles/files/gitaxanilinuje.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/d2lak8s7gdplmul8vgatp3udn6/rofenofujokit.pdf
    • http://banquat.com/userfiles/files/buxolukevexibe.pdf
    • http://tieulongcopro.com/luutru/files/zeninemile.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd92d2019---14214582.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210913_A4CF876301B2F887.pdf
    • https://madspot.dk/ckfinder/userfiles/files/lakebadanuselesixifota.pdf
    • http://www.musicboxpiano.com/contentfiles/37585365100.pdf
    • http://jtylek.pl/Upload/file/16482619781.pdf
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/milujiwub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+boo+apk+mod
    • 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_off0000b1af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 16792 bytes
font_01_sfnt_off0000c9c1.bin
06628b86ab3c6e3760411af9195ed6e2fea52af5b2eb9c493eaf09c20f65faf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 14384 bytes
font_02_sfnt_off0000edca.bin
d84b360aa56007d9a454da3073d0d32071801989f3dcfe11c59b5a9f5d716433
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10152 bytes