Malicious PDF — malware analysis report

Static analysis result for SHA-256 37be1ae65682a5a4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 15:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc159a2c9c53afc42b08f128a3333e8a SHA-1: dc0f20e4ef29ad14c49235db9cd8cef3f51a9f9b SHA-256: 37be1ae65682a5a481b63af92297ccf691b779b2f2ed24e71fe92bdf35703278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to WordPress installations that appear to be compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7832

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 http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d5ce08a4---56391812011.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728131e7155---93968543240.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bqv9f4l1k3s3tjhjtsjcokfs42/13508356102.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/60106276103.pdfIn PDF document text
    • https://fallsplat.se/file/vevojefufebifaxevojudubix.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210701052728_r2hwkr.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/firatititana.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/wumuz.pdfIn PDF document text
    • https://cargotavio.ru/files/file/782687530.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/57603830015.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ca2f1a68ad5eef3a9a3716bc4555bd43/dereragomowev.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/n7o2948gk0qkg2gvfnspn0auu5/91116141450.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3f50ea65118b61b6a1adf53723b0f267/8195393224.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/zonajerosab.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00c2b0686---zatojopuzinunibobogarukew.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mqj34msaanfrbnm0s503k9814a/kudadobilebokifaviroxuwen.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/08708ca3673c979d0f9e91acdc276817/60570199513.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/jatibumolege.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3cf1n1oje72o0j50h2b5hltfur/benidokefawonenugiwet.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bizigubuk.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a1027d57e---86673715986.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cd9f512783e92995ba01dd52f97fa2d3/dixorirewomalinutafol.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609181c681e81---vesipadidezokarefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+hacer+una+referencia+bibliografica+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/86eb2c8413f60cddbe9b8e8b01b30312/derisoruxizubavesowojoxi.pdfIn 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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 18840 bytes
SHA-256: 3c11019bbc4aaca4f12fcf1e8ce2d0318b46e20f2d761ef6791b662ab13e9b69
font_01_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 11072 bytes
SHA-256: 334ab24bd58356f06ef87329c68b5cc40bc2bf40685a9469186e557257b8af52
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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