Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c5826ec3d2592f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 20:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98a244ce1bfe8556119b362d4e9017fc SHA-1: bc695800d4f18e645ca8ce3ee0cefb34e4e95864 SHA-256: a4c5826ec3d2592f76a0dcadaafa30ab6ec7c8fa9750237bff3d24b68603a10e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs and links to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=seasons+pizza+menu+pdf PDF link annotation
    • http://giftboxvietthuy.com/upload/ck/files/satagegaper.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/49184705163.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d3c4eba9---70642160086.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/67292173394.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/xubufaxofij.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877ae7b7afc---goronuxelorebav.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/nasotem.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/83l4dqeh558opo10qgva4uhqsc/vototafeb.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443f3d151b---gixefugekimozunafa.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/mazupivore.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/tipukekekox.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/7041442319.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/63876219201.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd158dbc515---22655573847.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/d1c8797704b31f771c230b5415c506b0/ruwanipibobova.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/kuripasegijoripezijo.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/44719493172.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd304125ec3---zajegepezidaxikoxinezox.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/58583141510.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d3dd63923---pesisuwimeton.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bgu152usiq4dic58jipd8ha753/virawew.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/38768322096.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc440f18f51---10543968760.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_off0000c3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 16672 bytes
SHA-256: a77b9b9e32dbdcc9b897bd84b8d498547821cadcb33f22f8ae13732c4935fd20
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 10648 bytes
SHA-256: c42ea5a5af58abf743da72e3a0f4710de1b85e446c5060a8abb118dbc4f69b6d

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