Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbee983a4536624…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 04:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 699803cde2e698d68b9a3bcf829c02d8 SHA-1: 8d8bac0f07b6c45ccb93c73f94a7b8bb2a915a1f SHA-256: 4dbee983a4536624400dfd19e26da4545669528005af72d5117277c7b4de8c98
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content delivery. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=ap+english+literature+and+composition+textbook+pdf PDF link annotation
    • http://bmsorganica.com/userfiles/file/5166004131.pdfIn PDF document text
    • http://splogservice.ru/content/files/zefuru.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pevexu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afefb75a678---21660069139.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609476dbcb53e---73348754709.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/37b7c663eedb2cb2a9d9c9cb1aab2032/rilogibapofusidufosabopus.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/18900561828.pdfIn PDF document text
    • http://klpa.net/userData/board/file/34662167491.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/7367ca8a79e126c2a262c05d4addf360/82535497548.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0a1b101abd7cc7e8d746c8d84f13be68/82225792835.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lodojolulutofurewimezaru.pdfIn PDF document text
    • http://lyshiying.com/d/files/88169120098.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pvmf79n6f39eoh91n0bfqti2v6/60432683157.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/69270886691.pdfIn PDF document text
    • https://nada70.org/userfiles/file/8801953383.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/tofinosojotap.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ad2605ee8---1376308881.pdfIn PDF document text
    • http://texmet.pl/userimages/file/tivuxi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a3a16d8b---94866501824.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/94378982519.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1a0jtjl5j2imckkkf7ii5773de/18672217076.pdfIn PDF document text
    • https://wildnaturetravel.com/File/25679822260.pdfIn PDF document text
    • 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_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 17532 bytes
SHA-256: 322ad1bf7b126e8a53c9f6c78fb2d99acccbc560ed278e21368177544f368659
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 11480 bytes
SHA-256: 9d0436d2bc0f1cf10dcd2dc504d99f72fbca350d1c0c224381cf771dd2eee868
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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