Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bec3128a545c58…

MALICIOUS

PDF

85.5 KB Created: 2021-08-15 01:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 861f3188dce99a8319e158bd52810369 SHA-1: b412c3b173d6295c46d4131d4b801f0ee62c50d4 SHA-256: 85bec3128a545c58b3c6dc727754e557c2bea9ff517e6339bd84e084b85b7002
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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 http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813617be0fe---gilexavotitifuvilo.pdf In PDF document text
    • http://ogbchurch.com/clients/880797/File/10405831264.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea527264fa6b96ad441ef3149e9d4113/66674819506.pdfIn PDF document text
    • https://coevent.ru/upload/files/tifudigaval.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/ludija.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/76365167179.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8290ad6af8f4205ea545156fc7e61864/tuvojunubibelaf.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/58647116631.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/jepuxejapufawesolodujata.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/futuwonejozuxamuwukuxufe.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/golip.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/xolumu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/6342969630.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1ceba117---81335687526.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/39346508331.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/33567491703.pdfIn PDF document text
    • https://novitas.ro/files/36509897232.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3102a9563---64261796200.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/df12ace71b07a06f8284c5e08d564c3d/jezulexuxomilakabem.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd19644c5---mepemazipojoza.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/gixakamelaragusix.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/bavulotesimemozejumumamoz.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9ba93e8c---58079947764.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fu5ipfktoc9q77okdjse17tp1/19937140988.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e085043080---8314643077.pdfIn PDF document text
    • http://nkland.org/userfiles/files/tisilutisanabopa.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160734ee228179---putidaxiwajepir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=allgemeine+summen+formel+alkanolePDF link annotation
    • 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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 10632 bytes
SHA-256: 6917e46475b4c71de2c1845df1c9cd480ed8a4e3a88a5646f9debfd7d87ecdd7
font_01_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 18864 bytes
SHA-256: 2a7a08d6d5ea381f0430296c9db0d3bce97684ccd472be15cd70da2cf9aa3c64
font_02_sfnt_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1