Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ac57a8935d065f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 03:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a98dd9d8ec4880f79816d6d647648580 SHA-1: c06f7424b6bbbdfce4c64504c38bf36b3741a618 SHA-256: 63ac57a8935d065fdf51e782f9de4b3f7b93446cb9c13d70aa295ee19e5d9643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://infrive.ru/uplcv?utm_term=pulled+a+muscle+in+my+upper+back PDF link annotation
    • http://berbun.com/user_img/file/gijefoxizulawikogarimij.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b89bb7468bebab8ce59bcc7695d90d62/mixedipebonirufezibume.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926b9d86a52---lodulogozufumo.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/liselomapipijawo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/18996200479.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c52ac01e6---jesololisuwifugore.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/62607657505.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/tozuvagexu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/697c4f450e95d8c9c281106e79a38d8a/vopipakujafuzakixanun.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/namizusumubinibisa.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/sadereso.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e81efdd4557---7777823321.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/sekaxovopikesajo.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/vijejatomamixebilav.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2fmeqihv0m2n8ouuelkif8pm5n/wapogiwusaxa.pdfIn PDF document text
    • http://timebymtm.com/upload/files/82729220532.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753f5b4b844---jolitexerotaveda.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/zatipijuv.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/lijinukirevepopodir.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/59367703635.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/38756959001.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/koworafuwubal.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3fbbdae9759bbd54c59c8f16d8b05cee/dupopetikufize.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f0ef6ad653d8027b14f598725f6520fc/rutemodosojibawesuji.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff1b3beab---91186865605.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_off0000cc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 10904 bytes
SHA-256: 73726e9f37d016c3761d83cb9bfb00abe632881a05f8275df2f8b3748c3a8ecd
font_01_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 17556 bytes
SHA-256: e18ac6a39743445407ebce7cc0c2a5ffd6943a64cf778fcacae3ff70bd0ee97e

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