Malicious PDF — malware analysis report

Static analysis result for SHA-256 d332cfbc29507235…

MALICIOUS

PDF

83.4 KB Created: 2021-06-26 21:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c298bb2106ce6ca6955860bd4dea55f SHA-1: a390739f5143807cfc071c1fadf0125d8efaf4c0 SHA-256: d332cfbc295072354d95e6c242095cb41862869e798b966f5c1e2cee091bc200
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd2392d5d---xijezuguw.pdf
    • http://bitite.lv/media/txt/122/file/91351885074.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/89a3c1e11752d6d898222e5dd3046a7e/barulexamapuri.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/78613598291.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e23dd8996---89074903755.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0548b4278---99988639682.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9eb96ad4---fodopotudulazufodenid.pdf
    • http://asja-doll.ru/userfiles/file/nutubesikologezagifugaje.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8be861e4199744a3efd7a9bf3751b08e/kisirekaxutojawixog.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/56568393128.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/foxomimupalaguje.pdf
    • http://waypl.pl/upload/File/31417253397.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c9811157a4e0f59cd8f46ab0ef772e7b/1142487486.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a6b91488ef603376f2c064e8ff7227d5/47473056702.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c209e9e76---3199226780.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a431ac319a2---74441024150.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/47525249204.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e8b401fa9c37f3b6beedc290624a77c7/61175200654.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4b104dc37d1f28eb6a45400537f2422d/47808174550.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0edf92fb16029b38a5d4335857b4a48e/zesaxakulinexikuworiruxe.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd0e518e1d---vubugelekewulogud.pdf
    • http://zetrade.cz/userfiles/file/84396675155.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/523ec9229467ae1c667f96d1622cb615/wolamejo.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/gosigiwudorija.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/22ikajn9kupi314vgu7dd09fk1/32920642850.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=make+pdf+multiple+pages
    • 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_off0000e4d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 16792 bytes
font_01_sfnt_off0000fce3.bin
9b410a89781d30fb87f324f3b2cfcef7e5ae2fdd068fc57892c6694f4341dbf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16624 bytes
font_02_sfnt_off0001282c.bin
45601665050c19c7592bc37166b37820d37b6ff3ee1f83e047268b14a5fcb83f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 10704 bytes