Malicious PDF — malware analysis report

Static analysis result for SHA-256 c338a1fdb8602925…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 13:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c23c2124f5c30f9470898db24470df8b SHA-1: 15ab64d8ad0252365a6f040b1b10b6af8c62b06a SHA-256: c338a1fdb86029259bc34f3b261923fc9bff47ff146e60a417380a2017d0edc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple domains, including compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=control+phone+using+laptop PDF link annotation
    • https://photopoligrafic.ru/ckfinder/userfiles/files/kotizapesuzovosaxe.pdfIn PDF document text
    • http://julianina.de/upload/file/wiguxofupobozodaxagozobi.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109050436223991.pdfIn PDF document text
    • http://nktrading.qa/file/files/13082804723.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/wuxugatonitega.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/muxekokunilisejijebalonuk.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/birenapifegopugejup.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613304cdac693---70318728857.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/pavozunupaxekosapadaxez.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613109e5338b1---kovat.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/38266943222.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb689c931---ponomuwegaramugip.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/36393140270.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/kemisuboluzoloda.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/037aa0f683fe60587c1464ccfe9c26b0/nepibaw.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/posepavinupaz.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/lipiwijig.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/34530269063.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/80180652991.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/dozaduvejukitaliri.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/90092703486.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/4105370118.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210901120451_406705.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/10638766022.pdfIn PDF document text
    • 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_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 18624 bytes
SHA-256: 2c9ad816ad80b99a367fb1bcdc93df20abed63473aa17c8b769d496336937b96
font_01_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 10664 bytes
SHA-256: 699362c8704c00d823987e6b3c0a6a646fa6f0d67d3430277d45e8a4102409c8

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