Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdb08882e3da182…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 18:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d5723ff83bf0465a9f56ad5796b55cf SHA-1: bc188df7f18c1e152392b5a5f2965e0707f220ca SHA-256: ffdb08882e3da182de10a757574e7d2e9a7e2fa0ec7e37892036ad34beb665a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, with one URL specifically mentioning 'call dialer app download apk'. This suggests a phishing attempt to trick users into downloading malicious applications. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://spbmedaks.ru/sites/default/files/uploads/juxadenurukobu.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/8624533329.pdfIn PDF document text
    • http://jcpingie.be/public/files/63968260240.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/dukutula.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/divesowa.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202197711456978.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3bb69617---gawobazanul.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/21195092279.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b17jtiubaof0biphjg6com1tq0/vanupigewarerekubup.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/gapifemeviwugevusatekewo.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wuved.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/bujefitukavowekoken.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161354263bf5ee---93035544037.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/48779792205.pdfIn PDF document text
    • https://funke.be/data/file/poponi.pdfIn PDF document text
    • http://www.grifin.sk/files/87727838841.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/68651797228.pdfIn PDF document text
    • https://soechi.id/userfiles/file/88668314816.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/58435296102.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/54264077955.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f831e319f1---susofubenujavetufinix.pdfIn PDF document text
    • http://tdbm.vn/upload/files/44295145660.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tefemigefigagebezazoju.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/72032663950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=call+dialer+app+download+apkPDF 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_off0000c075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC075 16828 bytes
SHA-256: bccddf2f953e03648a545ca976197f41513790fcb40b29c54fb8030fbc35fc3c
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 10328 bytes
SHA-256: 926d8eaa27977cf7f0befed5d915901b20381ba12ebccf50157034a1ed245c4d
font_02_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1