Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8e5f6bbd3f801d…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 22:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ad4a33b4775d5bd84990abc4ac99f0d SHA-1: 64549aa0a0d919622de2fdeab0b5d8db51c64365 SHA-256: 1f8e5f6bbd3f801d9ae1c8445b821fe2f37afbdf35aa096c1c3aaa950a71ee77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to host malicious content or phishing pages. The PDF's structure and embedded links suggest an attempt to disguise its malicious intent as a legitimate document, while directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072711f0ae7a---13556645081.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e9306fbadc98f7d73194f6dc60c794e1/1811066800.pdfIn PDF document text
    • http://santabruna.cl/upload/file/salerajos.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a16a452a---79408879802.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/16334830634.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/87871924580.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/54736279343.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jmkskr2ck1t8a2had4vmtn55fb/begamofisikaladizek.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430185306170.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf2d7515b---16597771724.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/danebakoteda.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35af48c6a---bidasujutabawagemiwofi.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/83816335851.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2cc57511---94917262902.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/gutakakujifitor.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/fccc196ca715309e1211f6570599bed5/ludemugesapuzojegulegel.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/joxezenufujoxofikoxaleg.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/5574444056.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/golageropajomijer.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d438a56f771ed4d480382efd1dd3f24c/mefuwilubelenijodun.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/tijuvedidupanusamobe.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gli0eggngmnb1vkt4kbe16l3nd/titozalojaluno.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc65814e1---xezazuwifipiliwed.pdfIn PDF document text
    • http://gptools.net/userfiles/file/59638575721.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bemasedosikas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=windows+10+1909+iso+32+y+64+bits+espa%C3%B1olPDF 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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 18824 bytes
SHA-256: a163ffded8197cd1b44ace6f5ea7c6b6ada84fd5416a8ccb2bfb25bbe52944dd
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 11704 bytes
SHA-256: 75fde248a888d9c73afceeee5269896a67aca84351879b3b58689f33dd0d5591

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