Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cd3b7af1687949…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 05:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac413b4f04a96fcc881c4fb63b53be33 SHA-1: 459ee292c93237c6572a79841d2fdfdf4f022cf7 SHA-256: 21cd3b7af1687949f2ee66111143767785f64e01a32201c2f5843424c68c9933
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and social engineering attack. The document leverages a 'ClickFix' technique, instructing the user to execute a command, likely to bypass security measures and download a secondary payload from one of the numerous embedded URLs. The extensive use of disposable hosting and compromised CMS uploads suggests an attempt to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://archism.ru/uplcv?utm_term=you+require+permission+from+everyone+to+make+changes+to+this+folder PDF link annotation
    • https://gruntbudowa.pl/files/file/47063956062.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90659d9e75---78615993623.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/200dc7a3393368d77dd8fe5e9a9054f1/towelatonuxujed.pdfIn PDF document text
    • http://chapelguild.com/images/usr/37938342437.pdfIn PDF document text
    • http://artside.org/data/temp/file/37249492726.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04b93c894c---nomudiwenugo.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/feeeb47972cf537419177c8fbb5fdfbd/68420759865.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58fff08c33---929486672.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/46810983702.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/febenoda.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49caa69ec---31071884728.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/7998c4459c8c47f2997101c035e9b002/19297731283.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0fu5m4tg1grmkf96rfbuv88ilg/14989199708.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/juvawazolajuziwafujo.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/bexelumosowonemofe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78665441034.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/47440546716.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/07f020f270a0774a8e43b3ad9822a918/32720753586.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c0c6da54f---39648136873.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fulalobuzagipinijel.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a7012fed417c0a84df4ede366b9d3317/nawezojipe.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996f25517b---fakafawuk.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50c1d8f1c---97058127442.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_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 17512 bytes
SHA-256: 5b5ea6105c9f6b2136547aa741ab8970297dbf7214358ec8343897975898150a
font_01_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 11568 bytes
SHA-256: d578db9245494d18030c4c11681e8f0d520a6918f252f4570fa267dfce404352

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