Malicious PDF — malware analysis report

Static analysis result for SHA-256 98499c7a1554c005…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 05:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0792a6f51ed380af22dfd197fe8464a SHA-1: 86703b3499db06b635cdd44e9e32c38f9f128564 SHA-256: 98499c7a1554c005d269631bb1a9126700a73cd0cba976e3e9b5388ff392d214
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users into clicking and potentially downloading further malware or falling victim to phishing attempts. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to distribute malicious links across various platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/78e3f6558d32c086b86915f51ddf392e/19648894519.pdf In PDF document text
    • https://starbox.fr/img/files/zusol.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/pajifitufugufozudu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce202ecb20---75429837610.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609717867a68f---928914931.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2cc089346---80515657777.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/98243589284.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/vekageponabig.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5e842b4216dbd4cd90fa335112e1c733/kikelenizewer.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0194995ab044a8f95e7150fe91f3db15/43465120738.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d9aae6bf---nepulorurufeg.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/dorexirad.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/paxikekujanorijinagajesif.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1a4569406---nagulamifojenaw.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/98292955644.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a581a0ea233---13671728431.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/bosenewowi.pdfIn PDF document text
    • http://fields-on-earth.com/57287865941.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/4949350206.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/15318782954.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540519bbd5---rusawemelazekuxebuxos.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa579a722---67694540070.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/20384704907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=definicion+de+tabaquismo+segun+la+oms+pdfPDF 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_off0000b2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 11252 bytes
SHA-256: b9b146df9bf2665803145634f2f156e11d530b2eb1f86a6dbb1f1e17cde49b67
font_01_sfnt_off0000cc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 15276 bytes
SHA-256: 69e1ca5a4dfcb0e5997bfaad491b97e55402cb27fe2173218b01df1fe7b1316f

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