Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab39fb2ddb59072…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 09:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15646ae635be28a879b1fa77e825f4d1 SHA-1: 9d289ae95a382c380d3430a9ebf7aeca1cadff08 SHA-256: 3ab39fb2ddb59072213cc11a9874cefc0f687c9d43ceea27153c8f0095fb694c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a734289bdb34520c13bb9f753ca9ed22/67290321114.pdf
    • https://angkorphotographyguide.com/userfiles/file/97986423979.pdf
    • https://asset-books.com/userfiles/file/58806675005.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1311f4d4df7149e8ccc3280a77d83866/xoxalivedopev.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/voxusafelafufulawaraz.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ce01862dca8c99419bb5ea3a70a82fab/kewobininixidojow.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/63271ebd6f8a3c93973e3fc44262fc3d/13398628901.pdf
    • https://amatnieks.com/pictures/image/72979047330.pdf
    • http://lapenya.cat/imgjovesnaves/file/jetewox.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/kugezigeson.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0819a2abf---91358500839.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/67a7759880f591e24d32a646ce81b573/woduzuduji.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f2120e038223a50344952cefa9b790b3/13432345985.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3onvpg9sskbtlu3fouggnajuc0/51906768116.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6a49r8unqt2d4dm68fmoitpqet/33155714796.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d7d00193a---98485817233.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r2t7sqfap76s59mdh1k6nlof20/vileloso.pdf
    • https://chinese-wall.tw/upload/files/53834597002.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/bf9c0d577fc65bbad00e28940b9968b7/bejelob.pdf
    • https://africanresearchcenter.com/userfiles/file/kiwapowuro.pdf
    • https://hzautomatisering.nl/userfiles/file/76977786113.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/77b1271ee16d7c5c207d2d67420353b9/gegananurijojubonox.pdf
    • http://brainbond.ro/userfiles/file/74163518605.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ml+aggarwal+maths+for+class+11+solutions+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_off0000e4eb.bin
85c00e9d6427e6c5ccdf30666bf73867ca063e0b04f7c650c50e38ec2d7e56d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 16776 bytes
font_01_sfnt_off000110ad.bin
18d01636eafb985adb66df0f95f4a4cc3560b612676b4ba10755f0e77f99da08
pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 11164 bytes
font_02_sfnt_off00012a7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes