Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6e7b1b3c3c6ba6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-19 21:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6226bb8d5f03786047831ec1b7fdce25 SHA-1: 2573364171c0e87ff42b987281a90334f6751a57 SHA-256: 3c6e7b1b3c3c6ba654edc6d1a8704ebbea471d40504b8a0c6708213d417ef768
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to redirect the user to malicious sites, as evidenced by the numerous URLs pointing to compromised WordPress uploads and disposable hosting. The presence of these links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=add+more+emojis+to+android PDF link annotation
    • http://palenice.net/obrazky_clanky/file/pepasotupedezomagil.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161339bb417c51---xoguso.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/mepulakipupiparilo.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210906/files/20210906180230.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ialhqud1qvui5hjv9e83net0o0/12438336375.pdfIn PDF document text
    • http://szm.hu/userfiles/file/zudejis.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/falaxin.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lezakizireliloliro.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/vodidejewowitekufage.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/komirasagigikazulusulebo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/79385180738.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mukopabitogugorasabuxoto.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210917115408.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/tazawezerutudize.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/63363087491.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/92518598344.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/zisoxo.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62039122764.pdfIn PDF document text
    • https://micsys.in/userfiles/file/2149129902.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/45108227134.pdfIn PDF document text
    • https://msvadba.ru/files/file/pawabo.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/besarubotejusexix.pdfIn PDF document text
    • http://jfe.hk/userfiles/3781752862.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcfc4878da---kufapumim.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_off0000b284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 10476 bytes
SHA-256: b1a2e03c6159b3916f5793938c3f0699129f175f2f28f4b2323b7cbda9d9d3a5
font_02_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 14648 bytes
SHA-256: 0d1b856619b9c31c3455517609bfb5c5210282994cb1da2f94949338d810b297

Open this report in the interactive analyzer, or submit your own file for analysis.