Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e576188b22452d0…

MALICIOUS

PDF

92.2 KB Created: 2021-08-18 20:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e87eb87b3d179045f2c882cb876ae310 SHA-1: 4cb1c794ebd22f6c90d2166b0528420064a5969b SHA-256: 5e576188b22452d07002f72d84fb72a947efbc03a571f26277f49fe0665b8a3c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vb96ve04jr5oubhskr1grupah5/79076206968.pdf In PDF document text
    • http://wskinbody.com/data/boardData/files/gurubilofux.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6931e9b66---bolixunakovavofewovi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af1ef0284d6---xomevoloboxe.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021061502303770554.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/53660254868.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3b556eba---92097622552.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/kofafuzoserofomafiburufes.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/moturegalolu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f3528458832bc2ae9d2791e2310bb589/tisepapu.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/nezoji.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d51a9ab4e7661848873609ba803ec742/guxeramivadigubiko.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/53022719085.pdfIn PDF document text
    • http://abc-tel.ru/data/File/35643220640.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/58499796759.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/68514077174.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a925fedc77---29060988590.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/32676169698.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/da72b0lmbphah6c47j3lma5h21/70135227296.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/putomapejepeto.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/zifovus.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/diiagu0kfafka8nnetat012u9r/fekugukikotufagefagufu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/85133480526.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s6isfem5o64ud5pigo6trfg4c7/benijotaroxakonitokiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=honeywell+rth6580wf+wi-fi+7-day+programmable+thermostat+user+guidePDF 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_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 17184 bytes
SHA-256: f1a31cce16f2606bf9705546635d6c06c756040130ba8d81ad16bc34033602bf
font_01_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 12092 bytes
SHA-256: 060413e9c6684d1095742cfde6c4590d2157c179b81006ca22cc813043ba56af
font_02_sfnt_off00014927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1