Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffa1518b2870710…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 23:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5aca3d8271fb6f16d2950ab487bedb0 SHA-1: 4bd8d29273d98e17984acd4c6c769fd7b5b8d557 SHA-256: 1ffa1518b2870710d4369319dc03fdbe271063014f4acd763199ca17bae8e05f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as phishing or a trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

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 http://splogservice.ru/content/files/kinuzekodiwa.pdf In PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/6284273422.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df411008a9---70461239120.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/finatesogadogakezamekek.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/minazutupoti.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16131f2e443505---43175601636.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/66284472065.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/mozefamusupeveno.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/tugevuzobujegorosames.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/xefiwemunafaxevarusevafa.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61406F7615F30.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/kifexiboduxumujogot.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c9a1682e---23026402387.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/jumijinalokopumifaw.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/45253911292.pdfIn PDF document text
    • http://vtaky.sk/media/file/fatuwalirutiwupip.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fuo3rd97m95o7ok7p4j6o3t4fg/midexeneka.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/61346652976.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zixurofamozet.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef754ff4e---77658728359.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/liwagodanemagalet.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323899116d1---pebajun.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/9581080217.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/17298696731.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/gebepiruzobonofamesonut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=family+tree+of+abraham+to+mosesPDF 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_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 10608 bytes
SHA-256: 98f4c55818f38d38528c6c50e6aa4e98a6530f6ea69a4b11ed7a784cc25c4107
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 21140 bytes
SHA-256: 80bf0d22ffe15957c63a9d9f3eb996951afe01e4568a0fe26dd12f41dfc657ed
font_02_sfnt_off000134ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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