Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2071d2fd4bd7cd…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a9dc6414abc57c31c63b938e2f19efd SHA-1: 4982b372052a62bf1f4ba4579fb4a518e5c0b2d9 SHA-256: 2c2071d2fd4bd7cd8caf38518954f785ada5803ca5a4149490db55b8f48f954b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=mp4+converter+yt', likely serve as lures to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=mp4+converter+yt
    • http://milwaukee.center/userfiles/file/rixurow.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/rixipejow.pdf
    • http://brainbond.ro/userfiles/file/rupumolunadomerutaxeduzer.pdf
    • http://viprealestatebrokers.com/userfiles/files/baxabaxixekepabed.pdf
    • http://abwpetersburg.com/uploads/files/vixafap.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352e6e884fa---41919809288.pdf
    • https://onutglen.com/caningest/images/file/tubalopenasu.pdf
    • http://lubrifianti-auto.ro/files/file/47763842774.pdf
    • https://senegal4d.com/contents/files/zuzuzegelitilumunekagutez.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/454da1d417645d9ae7a31c88dd7a78ae/75072928395.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dcb627be4---85077782398.pdf
    • http://transportdiverse.com/uploads/files/1400282755.pdf
    • http://gsxr.hu/userfiles/file/sabomorebuzisagabosu.pdf
    • https://tonymusic.se/UserFiles/files/fopobonoxutolorola.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/6591163076.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145760d320e7---wotopojepakusuf.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/1ocoo6o9qqntj6rpl88vhu4uc0/gomukivebedowex.pdf
    • http://panziofabian.hu/fck_kepek/47095819486.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05a987818---56897241220.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161352391dd3b8---bimujurelorugubetale.pdf
    • http://tenis-klubmoj.si/uporabnik/file/72751967537.pdf
    • http://wedding-box100.com/uploads/files/202109181606008444.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/vigibizilodozezez.pdf
    • http://slovbau.sk/test/userfiles/file/pisej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b064.bin
673d1a46dcec1931a8a63d614bf0a0943bd93533ecfbc9da356f0cc60520680a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB064 10148 bytes
font_01_sfnt_off0000c74a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 16792 bytes
font_02_sfnt_off0000df5c.bin
2f17753506288efed15de55563ba4a657c8dad733ca1c22f10d76cba7f694a08
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 15852 bytes