Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae92aba57e73323…

MALICIOUS

PDF

69.3 KB Created: 2021-09-15 14:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36023e862cce769957548ef7d07b5eed SHA-1: 28ac739a06ad63770987c160c389ba4b5e78d3ac SHA-256: 4ae92aba57e73323a40dcdcd74c2b825a4ee3288ccfbf9f0244836459869f73b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obfuscate the true destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://moiarchitekci.pl/pliki/file/8022714384.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162bf6f7c4---jojowozazamalegeju.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161304e90bde24---25201138594.pdf
    • http://adec-interiors.net/Uploads/file/xizixanat.pdf
    • http://magogaralbamoble.com/galeria/files/46191258577.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f8be4678---45618279606.pdf
    • https://best-label.com/upload/files/70161364846.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/97444770900.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/11360563217.pdf
    • http://go-pxl.com/uploads/files/tazasadodixusizexegit.pdf
    • https://ovistar-dz.com/ckfinder/userfiles/files/sazesarasoxobotuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e57021f0---zenetivimanalumujivesitu.pdf
    • https://masukpt1.com/contents/files/69023023804.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/wixiladoxolakuzutaru.pdf
    • http://studiomanzetti.it/userfiles/files/pidorotabusozud.pdf
    • https://scalping.ir/data/files/file/2077701860.pdf
    • http://kientrucnhacuagio.com/upload/files/85252508082.pdf
    • http://rentbucharest.net/images/userfiles/34513092071.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139223020aae---gutakolil.pdf
    • http://familiegravesen.dk/userfiles/file/17439261851.pdf
    • http://myepres.com/HotelEstimator/userfiles/file/2103696427.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613be47e67543---zaboxi.pdf
    • http://topflexsports.com/uploads/vatuwesogoxepomazopeti.pdf
    • http://lineshare.net/upload/files/20210908161011.pdf
    • http://roycraft.ca/userfiles/file/98089458553.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=outliers+book+free+download
    • 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_off0000b327.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 16792 bytes
font_01_sfnt_off0000cb39.bin
1b29d100d02564f7e1e39c2b0f474248230269ed834ef28df6ade48d36dc0dae
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 14476 bytes
font_02_sfnt_off0000ef2a.bin
37625ed2a7472dd345caa80cdf8ab7200c18f352661c54a041c6beeae82d1b17
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 10792 bytes