Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ec09b1b77210ee…

MALICIOUS

PDF

78.1 KB Created: 2021-08-29 15:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d757a658dcec95ac923e1256711a9e SHA-1: 89264069c6884d4139ae11e0b3025351fb35ceb4 SHA-256: 64ec09b1b77210ee43bd6a2dd4a7eba1ca3e3d93ca098af126c25957065076a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://queure.ru/uplcv?utm_term=theodore+naish+scout+reservation
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bbe6421936852473428187b528e52b87/4250831544.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b4f93fe0---wajovezowobizekatonevi.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f3c3b87ec---borirogotuvonawul.pdf
    • https://adrfarysz.pl/userfiles/file/1949676320.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/rapogi.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161151f7d41cce---kifiropaniwipa.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/32666014784.pdf
    • http://vipnovini.bg/root/f/uploads/files/72731724162.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/78680733561.pdf
    • http://livestocktool.com/d/files/wizurosesijevu.pdf
    • http://dzbnf.com/upload/file///78122394012.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160706c0f99c56---tukoxotuk.pdf
    • https://o-dance.com/upload/files/14610340351.pdf
    • https://tagoproperties.com/ckfinder/userfiles/files/83140446580.pdf
    • http://sevinctekstil.com/resimler/files/69284366.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/stuscsp1a4n04hvofdfrhlcagb/70062495468.pdf
    • http://cungcapluonech.com/upload/files/lixipejepoberuxoxe.pdf
    • https://royal-art.pl/uploads/userfiles/files/34408657220.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/031017172743673e4298a220593d4b57/63000940131.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608191afeddf3---89794990746.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a6f643d8---gijitolivipuduvatosumav.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/r1ckb3ij5369rn563auggcpnf4/39580011983.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef767f3655---80225294402.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf7.bin
a4d4b6b001e651b68250c512438709ff06a1b5361cdc9eaef32a62ae5c31962d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 10552 bytes
font_01_sfnt_off0000e40b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 16792 bytes
font_02_sfnt_off0000fc1d.bin
ca2ab05695f1f5884a04481975da8e9f160ce1251b23bc6f8d5b809a4f3dd2a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 17800 bytes