Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4042e42ee447b8…

MALICIOUS

PDF

88.3 KB Created: 2021-07-26 08:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e94d1679b183645ab916a3a753ff86c SHA-1: 3dc58c0323d63b0376a7d126f82affebf769228c SHA-256: 0c4042e42ee447b81f2793255ef3648e2b0cdbbd396256d8660f941c1f9ea5e1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the presence of external links is a strong indicator of its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://agierresrl.it/userfiles/files/95179516544.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b3b34deb5---19990600073.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd965aa48e---nirapaxemexoroteboda.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dd66f4b8e87---10682821046.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vitowetubalupulizuzafigo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9fc91b3e---992831977.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cqbutjcof6u5eishbhvr3j1i97/67851295385.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jiwaxa.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210614081203.pdfIn PDF document text
    • https://binhvi.com/upload/files/67582467823.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b91a724b6---rusafebiwesawawesabisax.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/77675629533.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/10c476bac69101acf3878697a20f27e0/98584361474.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/zebobarelis.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/18874346183.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fa597b202957a0fdb15acea10bffc502/lekofiboduxu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2f7d2ab857445631ad84e509da10ac19/nikutusiju.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f5afaddd90ec30b501e2c5af5d2c9304/jepafe.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/47714887683.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/konurerimoduza.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/zogesonibanovinaxuwobaz.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210603103157.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/32147808821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+read+the+akashic+recordsPDF 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_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 16856 bytes
SHA-256: 914d7ae431197a2ed09b0644ca37521e5e568da8b486be46f3fc2bf8ebccba2e
font_01_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BA 10484 bytes
SHA-256: 5be1517cbc05e50c1d916c418a30e276add87f244ea2b84567fb11c78f224143

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