Malicious PDF — malware analysis report

Static analysis result for SHA-256 004e40b07d48a280…

MALICIOUS

PDF

75.1 KB Created: 2021-10-07 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 54c87b628420eba1a20e3c23275d6121 SHA-1: bc47a1b2b9fb7ca4438863fc7024c9e7121f07e7 SHA-256: 004e40b07d48a280cdc5509ae0593d46b0a9f70faf972a0f8486ff214752ddc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's intended to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://terwaarde.be/ckfinder/userfiles/files/gonilimof.pdf In PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/sonulus.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d7c7f2b9f894f74cb82a862c8510804/xirizijezo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/26oo1k7m00qujvbgoipmkd7vg3s45pjm/1171432363.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/bewujonakeluzo.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/lavexemosimobog.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/54895758561.pdfIn PDF document text
    • https://marosme.ro/hirek/file/kabif.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/28963203728.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/jojebuwawapebezusobaxu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/94158db9799599ebaadae18f90662eb9/18015221157.pdfIn PDF document text
    • https://artenika.pl/fck/file/7542655754.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/1359864095.pdfIn PDF document text
    • https://geniodelweb.com/file/vogoduvazalaxalijurevo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5ae6956b165b909c9268a13ef2ee3c02/62441077384.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/mokid.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/57737238860.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/puripuvubowegigone.pdfIn PDF document text
    • http://edituj.cz/res/file/nodefakikazewugatuximiz.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/31985193240.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/fotobizinenovadeletajoxu.pdfIn PDF document text
    • http://chengzechem.com/upload/files/85573369033.pdfIn PDF document text
    • https://kvzriu.org/images/file/vajizupikajugi.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/22929753029.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/fenivupovujorumusixeso.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tinetinemetirawitasuzar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=an+elementary+course+in+partial+differential+equations+by+t+amarnath+pdf+downloadPDF 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_off0000be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 11452 bytes
SHA-256: 8bc1e05d67645dc737d7bbc05018f7e762caa48219bfeffa7aa33e1ac32cfc23
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 17392 bytes
SHA-256: b551e9fea1da8eb250c59473d26793a3c4919a26799e18d9b3cc8785a1a5625a
font_02_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1