Malicious PDF — malware analysis report

Static analysis result for SHA-256 927ac8d212b51b01…

MALICIOUS

PDF

118.6 KB Created: 2021-07-10 10:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3d984916922b610194a5a9f39fb200e SHA-1: e48bfa408af20e68bd7581e9e5f75459aea99278 SHA-256: 927ac8d212b51b014119574995331039a8d5b24d6432783f35471d8855eff7ba
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, with numerous URLs pointing to external resources. The primary purpose appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tdkul74m739irfccdv7b5om1r6/83087174702.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/3494856092.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608507ce45896---xasunisefoweg.pdf
    • http://currycornersugarland.com/admin/images/file/runepixisozavupi.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c295f11e748---doromewa.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc107ea36be---39045013531.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2c2331185---52670911035.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/14c2b4f4b779e461e90511ddf89f47fb/66480545910.pdf
    • http://beiwendq.com/userfiles/file/senabilagenex.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a23b8744b06---34925871911.pdf
    • http://cnpair.com/userfiles/file/54871701962.pdf
    • http://happyhanool.com/ckupload/files/4666853096.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/59598510502.pdf
    • http://softwarefactory.nl/images/file/44607922911.pdf
    • https://adtw1.com/ckfinder/userfiles/files/12665873389.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/14719311ce5efb2c3e294b1066660f36/59885729659.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df71a519b13---kuninulinivexu.pdf
    • http://maslag.eu/userfiles/file/75819968703.pdf
    • http://skrabl.pl/www/rpbd/fck/file/96660252851.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa7d2bb2a---14213111687.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/kegiwupe.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/89983212917.pdf
    • http://k1a.ru/images/files/file/26104886612.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gloomhaven+vermling+mindthief
    • 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_off00016fda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDA 16792 bytes
font_01_sfnt_off000187f1.bin
f3b1fbe7a63cb8aebb92458ab0472a5bbb2cbf66e947d8b023883ecbf260d909
pdf-font-stream PDF embedded font (sfnt) at offset 0x187F1 10736 bytes
font_02_sfnt_off0001a036.bin
93474117556e18d740f6a87834b1618572b0a0e39319fda583c849d169419054
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A036 17080 bytes