Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b0abb9c4b4b1fa…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 19:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d79615781c3c3f4192b2cb77b4228edf SHA-1: 4779ecdd90527dc68d867c925ce513a81d5f13f2 SHA-256: 10b0abb9c4b4b1fa5aab76af5bd7bd3a578eccd17231239e43e7445113a8cc00
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is a phishing or trojan delivery mechanism. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly suggests a business email compromise (BEC) or financial fraud attempt. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, are likely used to host or redirect to the final malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://libertyrealestate.in/ckfinder/userfiles/files/31379448313.pdf
    • http://bilafafafa.com/shopadmin/upload/files/67364947099.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5dfedbb56c60b10bc31e1d92880d0179/nulosagolubi.pdf
    • http://mim2010.ru/userfiles/file/35059355139.pdf
    • https://natatourism.com/userfiles/files/42084701042.pdf
    • http://china-miyaco.com/img/file/202191712145.pdf
    • https://ikitellirezistans.com/upload/files/99981167129.pdf
    • https://mobile-translator.eu/app/webroot/media/files/79118145759.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e848b162e---diramazipaxanerimu.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/60423001141.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/40062331298.pdf
    • http://orderbestwings.com/uploads/files/5831661783.pdf
    • https://lecachet.fr/docs/files/63697340235.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/41e2d90f20ca784cb2c676491e1450ae/pubapufa.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/zogasitobozoke.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/65710425325.pdf
    • http://tugrabilgisayar.net/resimler/files/repelaben.pdf
    • https://kimansion.com/uploads/file/73975369750.pdf
    • http://fratellibeninca.com/images/file/xanopojozuvilugopogiguj.pdf
    • http://grandviewgroupresort.com/upload/files/fiwejurozupoxovasaluvakug.pdf
    • http://www.sun-green.eu/ckfinder/userfiles/files/nagel.pdf
    • http://lafiestadelmoto.cz/files/file/ligofabinesegulugixupe.pdf
    • https://hotelindigha.com/FCKeditor/file/waxidetubodomi.pdf
    • https://cncunse.com/d/files/zonogakisibalizuzavemaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+pc+keyboard+for+android
    • 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_off0000cf5a.bin
9c827256f568bf06972195c95bb2009acfdb49a9892424bdf66c5979b529d0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 17196 bytes
font_01_sfnt_off0000fb59.bin
f2df0c41a505fbdc457f766597b7f40d513f1dbd96af99daf468d4117ce6798e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10780 bytes
font_02_sfnt_off00011413.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 16792 bytes