Malicious PDF — malware analysis report

Static analysis result for SHA-256 902e9749b67220b7…

MALICIOUS

PDF

96.0 KB Created: 2021-07-23 14:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 02d55e07f214806b2f31df7322e3cf53 SHA-1: d5de14d8db92c7550daf2a83604e20c61142d940 SHA-256: 902e9749b67220b789360b37fc84337eef8814d50e597a94bff1c919cc3adc82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute or obscure malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dok-vo.ru/userfiles/file/95856110523.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ljgn59dpufig5teeoi4s3bmh1f/soworetudufalidimumusoxuv.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/78397331802.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/kidipob.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a40f3992a19172c8cf0dcb6045909709/jediwif.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddbf4a5c5---88508565178.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/i6sjj3k648lt4t8smf13qkfud2/21781988575.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/14d95db15ea4525924fc268a9babedf8/figufodazu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f51e61bfd---94865284790.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/kutetidulojegemikuki.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/78851871801.pdfIn PDF document text
    • http://sdds.be/userfiles/file/79069557480.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a36bd0409---dagaluwex.pdfIn PDF document text
    • https://webmenuplus.com/images/file/67758761195.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6956ff4a01667fd1582f50c11a1b23a9/68070767383.pdfIn PDF document text
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/zitupinolakugalipewukupej.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/kovadowozumumenonefojogap.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756afb6cfed---wepofubikewa.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/17505281445.pdfIn PDF document text
    • https://stopserv.ru/files/file/zuzugipika.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae370855206---pezivapaw.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/32148abb1f00b88d22607f26466f33b1/worobupoxaledere.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/31365720728.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/mered.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/68474485652.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/47870761239.pdfIn PDF document text
    • https://master-service.ro/images/file/tenozufowagujubasiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=simulador+examen+cedula+a+agente+de+segurosPDF 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_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 22268 bytes
SHA-256: e9caa815dc9dce643ae0b6b4bbdb6a8583bea7fceec7a00910379e666659387c
font_01_sfnt_off00013e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 10992 bytes
SHA-256: 64ee1187600f79e4d34399e892e5a44b78e1cad63c5af7ba092f6ec4dc56ffdf
font_02_sfnt_off000157aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1