Malicious PDF — malware analysis report

Static analysis result for SHA-256 364983a2d22c9f08…

MALICIOUS

PDF

83.5 KB Created: 2021-08-18 05:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8281bc34ea3ad393e16ea65324400548 SHA-1: 4f785c8cd163679b319cbac591c82967a5d29c9a SHA-256: 364983a2d22c9f0828aa91f308ab384bd86193c081ac35bd7746432c5480c97a
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The document body, though heavily obfuscated, combined with heuristics indicating a 'Payment redirection / bank-detail change lure', strongly suggests a phishing attempt. The presence of embedded JavaScript and numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, indicates the likely intent to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+do+i+get+my+incredimail+back PDF link annotation
    • http://ctkupavna.ru/upload/file/vapaxejadegabu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bibekifekizaxazexa.pdfIn PDF document text
    • https://maymac.info/userfiles/file/92164544295.pdfIn PDF document text
    • http://djpress.pl/Image/files/bumiva.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/ludularaxuv.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/komadi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf60bb2f6---99811628165.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/fiduwapiliwokixetugogenot.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd3a863693---feniwupufalomi.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/29610018912.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lalaveniwipufudexowum.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vafanokoserokomel.pdfIn PDF document text
    • http://keacg.com/upload/files/lakofovogedubemir.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160842afb7b416---7738264283.pdfIn PDF document text
    • http://www.asslar.de/downloads/puwojot.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/57696751199.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/59861319278.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/rakifugisubebodewala.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fae2a387e---dozupejapezakewuvusapamex.pdfIn PDF document text
    • https://manenshop.com/upload/files/96554757269.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e4abf65607f6332ee07999bca7682ed7/37211582483.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nn4rer1a2eb1ckki7utd8bfro5/41297676351.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/bivudidiref.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/26002103305.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10968 bytes
SHA-256: 03a13fcfc5a587bf0f8a3c7cd1633f726d17ed2fd72c67e77ef2c510d241c55d
font_02_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 17556 bytes
SHA-256: 440560ea064f00214375370358afa16e00a46bf1b46fabc8f43a85d91e3b5698

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