Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22682a0d68a2019…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 09:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7bbe630b2850ddb28445901b84195f02 SHA-1: 4d3a37be14a342f87cabf44e0107d62808429923 SHA-256: e22682a0d68a2019a0a451196d71a67903096bd82c50aaba8ef574fcc3d9964d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://ketchas.ru/uplcv?utm_term=spanish+american+war+timeline+pdf PDF link annotation
    • http://saikunghouse.hk/userfiles/14633291823.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/bususezasomobofivasazone.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c03e340f---4225982825.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4985d3ad4c---20249696849.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u2nr9rji1kbaqd3b7cc0ab2cn1/luzunakom.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/kakulifemave.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/xukaxa.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/bowarorilijikixoxawul.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/dajurika.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vixixapa.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/tebuluseralosobevoguz.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa815fd42---47835906485.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/81181663506.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2b258e2t6d6km12djvrjv3ie41/75497492713.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/kowemixupu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/f2uv038an5e78u6q61aoe0qvb8/15350894460.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fuxujunokujijovogat.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b23ed6840---71658575840.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/38653801770.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a6c8aca3---mebumapovilabaleruwoxile.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0318b74d---midojij.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/dekebelijeregenapama.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/56150543342.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba22802fc1b---25639115657.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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 10928 bytes
SHA-256: 1fb40bcaf3b6d20c7a48fae69facfa0b43d891ce6ecc2091cb19adb71aae1bbd
font_01_sfnt_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 16156 bytes
SHA-256: e6c3c14c5b574b246abfe93b8c1f6f8048e9c0c252cb201c67efa16dc5ffa530
font_02_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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