Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b6b4502c087ed8…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 23:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d62fbd411c58f2259cec9f3da5b5649 SHA-1: 46b8731060162b9e101fd4ff05b1aeb83a3411ee SHA-256: 20b6b4502c087ed842814ca74b1444f490f3cf4e0f812c7c259845e3ba40b3af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://drafthe.ru/uplcv?utm_term=pikashow+app+install PDF link annotation
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/93213829888.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a150e715e8---jadoxunopow.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/40288970452.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/lajuxumegup.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/lotex.pdfIn PDF document text
    • https://bselink.com/userfiles/file/16385392094.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/31732397063.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/35273527108.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/38932713973.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/xewuba.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/71750590370.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/89333894963.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a2bd2a615db6cfa0249f05bf35c35aa7/34214301033.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210905055616.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/vavebidofavapokenagowen.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/wobilatetedujibezezam.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210912063339542446899.pdfIn PDF document text
    • https://mmtours.si/uploads/wafefutina.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/laronepemowilunatami.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/7530332798.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/17595937589.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/pekaxuwururezabo.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vuxopapajudazu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161312fe7494c8---sapenap.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_off0000ad9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9C 15076 bytes
SHA-256: 4bf3a4d59f2e4d111484117e5e5ebb149bd6cf190247b6bb0a9f6cf3b9486277
font_01_sfnt_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 10296 bytes
SHA-256: d2c339dabced7c903e2bf888dfb94da0399c15cf1b27d55830b3b3fc21ba1fdf
font_02_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1