Malicious PDF — malware analysis report

Static analysis result for SHA-256 52612b5772c45f35…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 14:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f5c575060ca7f5f4a3e7452541016f0 SHA-1: 892af094a93b163115af556160e1c2658d06190d SHA-256: 52612b5772c45f351af1045f65d2e23d04e5935c98edb594fd842e5533e9accf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pistant.ru/uplcv?utm_term=anthony+michael+hall+vacation PDF link annotation
    • http://abwferrellpkwy.com/uploads/files/80162710793.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0ba46f67---58550555705.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/neragupiritojewix.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/57236770546.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ea31e11a---rumororedinasowasori.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/1924978143.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/43574280709.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/60987114058.pdfIn PDF document text
    • http://momsystem.ru/public/file/98660732147.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/10627032287.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/8n1lto5cbmqo60g7614n60fl0p/31453714440.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/walotejugerazodemob.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nlctnqhupjviu4f1ffseujvgkv/79141217880.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072834da7680---zusijew.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071295059bbb---94949823389.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0af405a6574dac3173a1aa989b2e5b53/74111834157.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8154c3c8a---82578916989.pdfIn PDF document text
    • http://mccartha-cobb.com/userfiles/files/xokidulopalo.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/mulirejojusaval.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cif1u6giidv9dr8aodpisk7ev7/gajuvabojumibusus.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210814084542634.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc40bac7600---gejuzezukafepawal.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/37274258383.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc726ebe6---77128705812.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4l9fhl7bjc80fk2gr54648cukc/24056181882.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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 17992 bytes
SHA-256: 793d40508b61ee3d77494d57406183ebdd2aacacec099c08580fb314ba4a47cf
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10388 bytes
SHA-256: d3cb32c0b06f75654366272d04afc5b6d71c9b97b88df2c1259264df7b1b76a9
font_02_sfnt_off00011829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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