Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f350a35a162f356…

MALICIOUS

PDF

93.4 KB Created: 2021-08-03 22:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 598a18d822e6a4b231c7b0a855e5c2f0 SHA-1: 95a94e76ba028a1a7cfc53e1709a950c0755d848 SHA-256: 4f350a35a162f35639ba1157e4a86b8b93c62955f36378c9e3ad6dfbee20bb86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://medvor.ru/uplcv?utm_term=how+do+you+calculate+half+life+in+chemistry PDF link annotation
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609f495412641---7468708697.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/16124407853.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gikimujokijebafejoj.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/rubupuribazev.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608012fa3d8a2---bujorifozobibeti.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/5637168880.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4926c0c1af55cc6047a6132bdb072e9b/27326275847.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/liloboto.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c178d45eaf1---75115547907.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4pmds2inus5kbo8bal40a097k2/28102785802.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610053e5e77be---rodeki.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/85129008268.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/89762704953.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/12t49gdr99fbeqo1tv7q264n6n/91705679788.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/sutozoxofan.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/petofogafovovigolagoxaba.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zitowamoxolububagivenuj.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/20944138004.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/14977654159.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/lokokizugajeza.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/19138629008.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rglu6phj9nlav7b34lpecdc3n9/vunuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/njbi2823mu93s18s67oqipeo40/geparuwepodufisakido.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/subigepejenovi.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_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 11032 bytes
SHA-256: de9903cfcc2b047250e7168fbcc9a0ac5367048cf30f0ba7a00005735a1260cb
font_02_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 16972 bytes
SHA-256: cc6c2b84e15df29c1b61835e762adf1d4ca4239619cf397213cb7cc2d5c247c8