Malicious PDF — malware analysis report

Static analysis result for SHA-256 251107d5d0f64872…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 05:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be603775673cfdf1f0d5e7557baabde8 SHA-1: 12d39a648fabf6d1775b608bea016e32fa4b3881 SHA-256: 251107d5d0f6487283fb95046cfbd595c37e67feff68ef399189f21c4d889346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=y8+football+league+mod+apk PDF link annotation
    • http://christmaslandint.com/userfiles/86928001422.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/19979258987.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/wizuvunesuromuzufoz.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/laparexaza.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/67074156496.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/sarisaki.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7d8c61f3df2370dd1bacd0c25e489a4d/79139576672.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/buxugokefutuwisemebed.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/vegoga.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/86646258362.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6eb319bc---bojirop.pdfIn PDF document text
    • http://suaups.net/userfiles/file/zupemewexozisiwib.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/81955377151.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/ranetutiz.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/39642410424.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fukodi.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/73710848267.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/ronovejavuvefixupowejiwu.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/66834097909.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/59725900379.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/857f2bb3b18bea1ce572b5becb14a4bb/jugetaxujujudupimurixobu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c8703eabd---13080042819.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/negirefeduki.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_off0000ae1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1D 10900 bytes
SHA-256: 1f1a1b5d53ef102c2c0588fdd9736c064e32aa961b85fe65ad25eae1ca908d33
font_01_sfnt_off0000c701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC701 15124 bytes
SHA-256: be06eb2b906786cc9c7544890a5a703acc939445d7f71f7a28de873f2be14091
font_02_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1