Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b42d9da7ec2823…

MALICIOUS

PDF

120.2 KB Created: 2021-07-24 18:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19e1d4fb869d66e35ac3e03b14ecf647 SHA-1: 58a2ababd67ec2aecaaffc61ea3ec21808df1634 SHA-256: 00b42d9da7ec28236c9e2723906095dc208d089881c2c9a09acf05015204965b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://whitesal.com/data/images/file/3457_20210704070704.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902b93a1abf---nafoxejuvogikasuwipupusu.pdf
    • http://langfordfinancialservices.com/userfiles/files/voluxurefimukifodof.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9s8the10rfrnc9djveesh73ml1/zanotazulipep.pdf
    • http://goraku-sangyo.com/userfiles/file/tozaw.pdf
    • https://aquaprosmart.com/userfiles/files/bavexusazazomojup.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/fubinosatit.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9584953e---97319254552.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/sb0snepdvudru4vpm8tmr6phl3/wawisexitixujej.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/mibem.pdf
    • http://parzenica-bialka.pl/userfiles/files/15161775739.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c6356c0d4---63382666319.pdf
    • http://teakdeck.pl/files/file/tenib.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bfb1fc19ea5e9c03a007e405cab16d86/87302933089.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086661509c39---88551045851.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c19873719dc---rowivox.pdf
    • http://grandviewgroupresort.com/upload/files/97670927055.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608364b35dc48---73054061601.pdf
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/54469327321.pdf
    • http://animationcoach.com/userfiles/file/vovage.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s6mos5hpvqsv0ejdkknljbpc3k/91556049079.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22194663e---72576748326.pdf
    • http://chromatographvials.com/d/files/17194546050.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a436eb8e0eeb16c709fd7bf4e7d28357/57443502013.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6ef6000488f6100c7c2953f92477bfbf/zumelanulem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=proper+way+to+squat+with+dumbbells
    • 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_off000170e9.bin
b4358fe239e42e25117107bf3c2893e016b4f11955cb8188ee964f9f1cc4a791
pdf-font-stream PDF embedded font (sfnt) at offset 0x170E9 11140 bytes
font_01_sfnt_off00018a94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18A94 16792 bytes
font_02_sfnt_off0001a2a6.bin
e057bbf3985a417f166c107d73d8beaca6437b9bfa11e2362bb3f1d782332a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2A6 17796 bytes