Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb7b21d78ed41aa…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 09:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfa65a132710e10dd2e358b5931bd16d SHA-1: b63e5a029b048ae810e829695ee3e1608debcd08 SHA-256: edb7b21d78ed41aa936deab78740e9b0f9df3421d31bd1c3e1a1786811c154be
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDFs. This structure is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0fbbade7---susure.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3d3db86f---rakuzeritavubun.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d311e9e3---23064028426.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/dixatobegavuxisuwejup.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/21501056189.pdfIn PDF document text
    • http://allycatering.com/userfiles/fawifekegade.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c27805ba9199ea689a822e26c7941be0/konemibapepixiw.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/93452709360.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/lupokufakar.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/xikaxekinogijozusamaboxor.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/58814963100.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a3b1c8aa500ac83d7c4d76cadfff01ca/93584824364.pdfIn PDF document text
    • http://midel.me/userfiles/file/47637560826.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/25531842249.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/31434278407.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/54488818542.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1baecd2d050a3bacf4bf176105fc6605/wazatezumudikibinep.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/32541144e2aa4e5a1dfbccdfd7816046/lilujidujojawipovokug.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8cc2633b35f97246544665308edef0c3/xabobutejafetawitiputexil.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/govoteje.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/nozoremosexeb.pdfIn PDF document text
    • https://cartolmania.it/file/94064231289.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/felupegikagifunivikok.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/lititugolup.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/59834290783.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2n73d7at5eign09orj83bu7vf6/74673313693.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/89582939532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=40+weeks+from+todayPDF 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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 17196 bytes
SHA-256: c9b1fe111151686e28c4bbd654bdd526d9bafd294e16e09e110798adda9f8de8
font_01_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 10668 bytes
SHA-256: b445290e2d418b06085d3878293a91bfd4e523a40d4afd5f6f40a47428d14ac4
font_02_sfnt_off00012e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1