Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66cdca7887aaff4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 13:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7eda2f6d63453c995f07bebd53f464b SHA-1: 8c53cabd9a735814628ee68efa7929c928386a40 SHA-256: e66cdca7887aaff41d6850a30ede22ceabf744e71c65d01b0406fd0b9ac90db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lure users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/mopapevuwumejopofamasis.pdf In PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909011528964786.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/85976358410.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/rilajuwurexizorakala.pdfIn PDF document text
    • http://parfumland.sk/upl/bajizajakajurolo.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/runadasaxi.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210905_3445C845C5FA6203.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/dopojejejulafopofofi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/97832685360.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/20844148277.pdfIn PDF document text
    • https://parfumzone.ro/files/file/vopegoxaja.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/jomite.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/66107837313.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/lobikezenexofetezaxiwe.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/segosarewotewiw.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01fdad4d2---44376616365.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/bovabokedujibojafigagoxof.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/kixejimezuli.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/vekoferejokuzubir.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd21e37110---vanufowolawikusubokamod.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/navifofupidufokanewa.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/54155408023.pdfIn PDF document text
    • http://delve-cr.com/uploads/36554915875.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i4m3kgcbr4lhsltl429dpsgae5/18049423132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=instagram+latest+version+apk+download+2020PDF 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_off0000b768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB768 17240 bytes
SHA-256: fe665e8c44e1808b38d408d1ed4a1a09a1ef9567958360d08b039d16c984aca5
font_01_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 11172 bytes
SHA-256: 011666fa4849a2ac05e4d8e10a44651b60a23364c325f6bf3fbbddefed22a5cc
font_02_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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