Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdc0cdd3134aa69…

MALICIOUS

PDF

97.2 KB Created: 2021-09-19 09:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f973aa3dc23b6b43bb4dd8eafc10809 SHA-1: b2ece87a95daf609094d542ef446c2c8bd66e2d8 SHA-256: 9bdc0cdd3134aa699afa0071ec5e15781bac3d771de9fd849334324bb801a317
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, and the 'Fake CAPTCHA' heuristic indicates a user interaction lure. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://chelseafoodmart.com/uploads/files/rutiraros.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3b27290b---56173184096.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130920253ea7---81376451499.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467f3771eb3---nagitawodasenawizigo.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/tuwituvizikejovawem.pdfIn PDF document text
    • http://ewtch.com/upload/files/kagiwudujakazekozusupuge.pdfIn PDF document text
    • https://togeltop.net/contents/files/wiwutofimisomiriduzuso.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/51946101277.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/visukazame.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/wijegokufalomurixarimum.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tajiwabufabadawawik.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/80246031337.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gusexoreruxuxujun.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/41992702260.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/fobaroruzezademolopowuzas.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/mefetakata.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/18324369643.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/bepevevunur.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/65bb4e0f14024a0aee52e4c9b575ec8f/nuzugudopomugenojidenadov.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/2365866782.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/77625984174.pdfIn PDF document text
    • https://brs.jo/userfiles/files/wetudewizafinujage.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///54416415547.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/ganorijabuk.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/pepuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+v+bucks+generator+chapter+2+season+4PDF 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_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 11088 bytes
SHA-256: 6fbbb98944558658e8e394e9a2fbd29f30b290038bfc4818a1dd865fdf544600
font_02_sfnt_off000141bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BD 19896 bytes
SHA-256: 89088274ebd5ef2b9cb3f394621b69e4392fd0473444c98fb8d2c7bb5c3985a1

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