Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b6e1838f179610…

MALICIOUS

PDF

87.2 KB Created: 2021-09-10 13:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbaedc76d22dee036d605b376bdcf453 SHA-1: 6987931b4bf87e28cbde10a32c806e23b6957978 SHA-256: c8b6e1838f17961002ba8a263b79c2564500a05c999c2046fd13dcda2f55d1ce
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://triyoga-tv.ru/userfiles/file/tupatuwote.pdf In PDF document text
    • https://manorhair.com/uploads/files/202109071956326354.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/58287707649.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137afdd74b2d---30394866596.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/kukop.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/sarizuxujufefodokodosud.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc46db849---marowafajib.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c087cd11fd721852f55df700a2fa0e7b/20287040710.pdfIn PDF document text
    • http://headrepublic.pl/images/files/38510286962.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/kitela.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/54739975590.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/nilajapaxozi.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/vunevasik.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/64664f7f2cf6d28af90ba8da8e71d6c3/74648068056.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/galofibuzogizad.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613312dab5a4d---kisesagapobilivav.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63bb58277---7961219703.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tozevugixudak.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/22900370035.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/70220810092.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/movone.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/77238911010.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/36285269130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=photoshop+2019+crack+macPDF 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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 10820 bytes
SHA-256: c6693f25c6052cf2006b7f5536b73859ba6919225a5c96295d5e4ae66f999aea
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 18608 bytes
SHA-256: bb4d409b273ee7e4e3759a41660e0f5cebd13022236da7c9d0bf73641758337f
font_02_sfnt_off0001374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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