Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc41c0152c0cd432…

MALICIOUS

PDF

86.8 KB Created: 2021-07-10 04:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64c1c864eb9a1154c8e896d16e14af88 SHA-1: 33dbad192cf4cf50c991b5fb642a748a3db1b4a7 SHA-256: bc41c0152c0cd43240c3c5cb5e005a39d6aa398a34bf416c5c161437ddd3ab2c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kclandscapes.com/ckfinder/triplebuserfiles/file/64573645225.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/78stmr5osnpn46sm4roc5rgtpr/jajujiwoferidurixu.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af97a33388f---35702662143.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085abe43347e---xarepojudopubalupepop.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f9e8bfa2d314cabd706f60e7aef82b95/18395185343.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/2310669466.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/95427706124.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fb17d19161fdba1646330f79a5404d24/48140429506.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d8bf04bcca177918c60fba1c492eef74/24229468141.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rg9r2hkfstp3pcsjkmmqo5c1sp/8320956345.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k64ved5n0bon6jkf865k15jnv6/79047959071.pdf
    • https://cissud.eu/uploads/ck_editor/files/10464950887.pdf
    • https://songhong.info/userfiles/file/46467742328.pdf
    • https://dallaslandscapedesign.com/media/files/19422303312.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0eaa20812b2c6f9831bf770f89cdb9c3/91463592362.pdf
    • https://prtl.pl/userfiles/file/93548116077.pdf
    • http://italianopizzeria-pg.com/uploads/files/54408334336.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a816a31b690---5820760700.pdf
    • http://dilimkebab.com/userfiles/file/jonuded.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/r184p43t4m5p3ubnk4rqencou5/fipotijodiso.pdf
    • http://work4shop.cz/userfiles/file/tijexozokita.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/befusofolopa.pdf
    • https://aquafilling.com/userfiles/file/lowebaruvadotoza.pdf
    • http://ckpak.com/fckeditor/userfiles/file/76826225111.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d60eeefbe5b084e2e1059c4794ceb43/fupozebopinevaluxoz.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bs5lai75g0bl9caa1r799anjl1/54655335141.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=french+english+dictionary+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a1.bin
1d635c5a974b1a95b804088d6431e362c6ca9e3cabe4dc6078fbac15465fd170
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 18564 bytes
font_01_sfnt_off00010543.bin
831e63f55fecb0b3d1e0019ec2c109827478611dfb210189d50957eece711945
pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16424 bytes
font_02_sfnt_off00011bd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 16792 bytes
font_03_sfnt_off000133ee.bin
55aedde22e3ad107f2f2c29071ac3174bfa5a25edd43cc6b671d698ce678ca58
pdf-font-stream PDF embedded font (sfnt) at offset 0x133EE 10988 bytes