Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19dfbb2f9c52a31…

MALICIOUS

PDF

97.1 KB Created: 2021-06-27 05:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eeccdea3233bd93598106aa19be6258 SHA-1: 23d74c828547c49ebf8c042a55d6a766968559f6 SHA-256: d19dfbb2f9c52a31741c748008e175f45c39ed3b172a7e40a32513ddd4ab4e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://garglob.ru/uplcv?utm_term=quotes+feeling+alone+in+a+relationship
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4c167d6e6c58ff8d2b2a9542cdd5b09/suratolusapekibakazoseno.pdf
    • https://przyklejki.pl/userfiles/25522002291.pdf
    • http://fence-alarm.com/userfiles/files/xiravisej.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8738ae2093---83066878518.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160befe5084c51---zetelaro.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c6a24350b---tutarebijerutiluvuwu.pdf
    • http://bellina.pl/userfiles/file/47193680997.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8e5bd62fcab7dd883317144da4361091/rifesumewofotajo.pdf
    • https://alutat.com/data/file/ledorotarufekakobinagetu.pdf
    • https://aduanaldelvalle.com/userfiles/file/subotodud.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9go4ll77r0lm3p6e8jo8ot19o0/kokanemevixaxe.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/240b4fab213822dc6eaaf06827fa8d69/87034050825.pdf
    • https://travelsafeway.com/userfiles/file/90451624542.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1ca926d081d40b2025b1846a6aa13b1d/51679764948.pdf
    • http://www.niziointerior.pl/upload/file/dukosanudelajuwajogixigon.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ecb108bb40f8e47e4f6370efdc9d48c5/nikutobisu.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608140cf83bfd---lifazamirurorapowepa.pdf
    • https://narimasu-chintai.net/jcfiles/file/74284681668.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/065ace02f25a9fcc1fa12b949c53a9d8/revez.pdf
    • http://gleneaglehoa.org/images/file/84354402959.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9e50fe37---3152556559.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/74663665272.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011958.bin
3434ad121453eeac03e40d7a4d66e2e98f37f0ead2f6230780cf2044a360d4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 10796 bytes
font_01_sfnt_off00013246.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16792 bytes
font_02_sfnt_off00014a58.bin
ab669a7fd9d96d6354979b8db83c1ec1b5f317d683a9c19391b9602fcf330be1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A58 17412 bytes