Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe16e3f7fa1f805…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 06:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cea001bdebc4af8af041431c4277be2 SHA-1: 5dea487d228b9b47164363080c3530632ac138e2 SHA-256: cfe16e3f7fa1f8051467f2a637d56a04927eef108d588b0f28ab706686771bf4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of external links strongly suggest it's used as a lure, likely for phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2938fabb8a---93794378676.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/66126971864.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/07mv8of7k21tf05g0r3ns7hsbi/36307263978.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc67a1340---fopusudodufowuji.pdf
    • http://teraval.cz/res/file/gosusojanerovimok.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/bbf0efadef501d4e326c246efb7e3c4b/49347058121.pdf
    • https://urbanlivin.lu/userfiles/files/94376004127.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55cf6e9706---26651424155.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b5dcda32---kowebozepidoseroduzal.pdf
    • http://cartopack.com/Images/file/wadeduterafipapovof.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fm5it7j3bps0rkl85v0tjh61ks/gifebojebifibadifepusi.pdf
    • https://giolog.biz/images/bulk_images/files/22132052376.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba56de734cc---fefemivinerewig.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/4a277982874834ea2bfdd665efd5617d/5879424649.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633d22fed1---73961890493.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/cd7f3fdffde5231721c369857d3c6f93/jofewesixawiladunaja.pdf
    • http://hzdsbg.com/uploadfile/1622021525.pdf
    • http://accessiblevehicleservices.com/userfiles/file/87168553464.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a8cc5c794aeba7ecc236ebcecca0662c/77481306099.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c725134c13c---vebuvuruzisakosifu.pdf
    • https://transport-vehicules.fr/userfiles/file/rulegafoluferiza.pdf
    • http://salukool.ee/upload/userfiles/file/jusizugakerunujowu.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3046476764---gerugogim.pdf
    • https://semineebrasov.ro/printuri-fi/files/taserosis.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a7de3a8e---33038785678.pdf
    • http://4reality.cz/userfiles/files/vakujuresofedijonako.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8a8b7be7c885e4046db35053906d23b7/86703610036.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=a+hitchhiker%27s+guide+to+the+galaxy+42
    • 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_off0000fd1d.bin
16ecb0a503b92beeefb216dc1551bacc3d3b9397508b543b120467d8263c33de
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 11168 bytes
font_01_sfnt_off00011766.bin
c02daa3570abb209b7322a52475ba5f5596c0cd955a178e3d319cd76ad96d5a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 17272 bytes
font_02_sfnt_off00014475.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14475 16792 bytes