Malicious PDF — malware analysis report

Static analysis result for SHA-256 19836a695452b8e9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 16:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6938dc4873665ae1d3c617434f9d5fc SHA-1: f1b32ecac4d5a125dc704fa5eab323148d632ac9 SHA-256: 19836a695452b8e98fc770d57c3213f7b387d9cb040596470aed57e816798d01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of external URI links indicate it is likely used as a lure to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=summarization+in+networking+pdf PDF link annotation
    • http://blissworldbeauty.com/newerac2c/userfiles/file/63394697015.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/60038341637.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/neoa32rho9r2c3u99fg92m4dr6/50377404161.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/49d85fdfc51fdb2772e02b549f1b81b0/mofedopurivu.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/zefixibakotijilagujuvef.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8538b3bb3f2b5963c8a7ec720eddd8e7/gawamozimujug.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e6b63aac4ef1ddb6d8d8bd6d160927e7/rumififivikamazakamukoz.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/vamunaladomipigu.pdfIn PDF document text
    • http://learningkey.org/userfiles/31354841499.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/77055049445.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/75711686113.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/52138765639.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/37307555826.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/20702950909.pdfIn PDF document text
    • https://ip-pharma.net/data/files/75507519292.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba7833605---68042115216.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8f07c098b8378863dad24f3be148ac7b/75459622460.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/kiven.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ffea497e7545658a10888c89eebcd366/puxetiwogazezugopakiwo.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210702_024F23E6BBC71251.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160824f2eac7c7---39350539201.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/pawufamotijuwibelowokul.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/mutaso.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kanozufukopi.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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 11040 bytes
SHA-256: bf84af0acc9a57195f90e0aa930d96405f216ca6e003b5e40e7213c66e455cc6
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 17408 bytes
SHA-256: 0b32f4bbe93280d343de3b3688dbe94ef5e09198d997b4a75fd7b3a1839d50f9

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