Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d4bb61f95ed2cb…

MALICIOUS

PDF

102.4 KB Created: 2021-09-06 15:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45d01d4f01836b5a71f12794d93fb2c1 SHA-1: c2a6ba10e24acd1f9ad5e97427bd7708b29689db SHA-256: 82d4bb61f95ed2cbe4affbce952e6c05a95dc458512c32a9c7609d5a0ad26907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://beldaoyun.com/calisma2/files/uploads/31276168784.pdf In PDF document text
    • http://melodylavernebettencourt.com/media/file/1766988118.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9d372229---22198930667.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748037a0b27---67889946252.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9655d28a1---pufujubunuluziwatularixe.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/vipisaragalisob.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nm201tglif4tq2p1803h2jc95n/pesapon.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/luligarasifapugurerefan.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gawupu.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/foxaloduma.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/1212454214.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eed0625d65e33d02fb5bd49628a4192e/tadigexigosexukejiwa.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c755be9a591---jizabuw.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/od4cvvg6vkk2k4jarg283iarla/49436379926.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9jpvgn1i24vn9fu6ia24jbnhdk/79622978056.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/dojobegevebolewixinod.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bbcngb9cl3klultrmanlgs2ea4/50486933562.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/6344544823.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/io007cv987ns1fgv5kc7a5ki9i/woposarutimuwidovaden.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1767a94d---95147593681.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/wuvokudugolulavizidipive.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/fexefaganavagifulorewe.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2cfa1e67---wisus.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2a858085a0b41ba4c1e8b60c8882106e/39529255837.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/gazukogezogukisute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=antenatal+care+in+nigeria+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_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 10488 bytes
SHA-256: c51de6c715cdb87c04e8b757231cc68fe5f32a5ca4df04a8314fba8a078f1d86
font_01_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 19100 bytes
SHA-256: 26aef766aa30ecb8b8ed05e4e5d2968f586f003bac7b9aa28147805dee58d0e5
font_02_sfnt_off00017389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1