Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e50a487a95974cb…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af3aaa47f7ffbfae5218c68ed23a930e SHA-1: 2faefbac3ce4d31df82ff6e7a7c70170091c311f SHA-256: 2e50a487a95974cbd2230edce51928f4ce1bdc435b1e7034414f5ef6d0c6e7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the structure and URL patterns are indicative of a link farm designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ellev.fr/upload/files/fixegimepifesova.pdf
    • http://hfengly.dk/skoleportalen/userfiles/file/89368387705.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/52123631234.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08a1ba524---63665634730.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a087637bbfa---33164526221.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a2c858840450e186a6afc278bd5752b7/lojukigumuximemu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ghoqe0id7e87a6f4ah0aig3is5/dogikuvomam.pdf
    • https://advik.net/userfiles/file/85226589438.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfdc77ede---99217697513.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/50762286770.pdf
    • http://babamoleskine.com/files/file/nilowaberomolotexugakivud.pdf
    • http://pinturasoltra.com/images/slider/files/55168051658.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gcl89uid6ppjb1h80e6toj23nk/kuguk.pdf
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1654a6de7---gawezunukasofadupibofa.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/12706312506.pdf
    • http://geodeslaboratori.eu/userfiles/files/xikutofewugudarabi.pdf
    • https://webmenuplus.com/images/file/73590124922.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qefk4dnitjcavjcnp5q4u3hn86/ledunepidomilozujakezoj.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ade3efa9b---lekesigavesitofo.pdf
    • http://nfc.soo.jp/file/2547319602.pdf
    • https://hondaotohaiphong.vn/upload/files/salobivosiwilutenewip.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/vujafovokebodi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=exponential+regression+worksheet+doc
    • 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_off0000bad3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD3 16792 bytes
font_01_sfnt_off0000d2ea.bin
40b6cb7d853680fc580258ae122d061332e00d6accccc2c0c4d2da6d559d9e63
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 11056 bytes
font_02_sfnt_off0000ec74.bin
8ac98a0556f0cc978fdbfda0d044af7cfd1c5da73247fcb26b4171bc94f6ae93
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 15832 bytes