Malicious PDF — malware analysis report

Static analysis result for SHA-256 19944c01bdc56726…

MALICIOUS

PDF

75.8 KB Created: 2021-08-12 00:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6332ba49f3a4377f1dc94298643c050f SHA-1: 660ac875e799ff6a4738f1d47a18f5ac2a3beb16 SHA-256: 19944c01bdc56726645fbdff2e12b5bdcd45afaa4bc4ed3bd518dde259aadf00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=characteristics+of+quadratic+functions+worksheet+1+answer+key PDF link annotation
    • https://ferdavagnar.is/images/fck/file/47185510005.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/87280412830.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/tanup.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc3c73e3d5fcd3b17f900db7a17660cc/votamagikepuneruvevizo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ff9ec598---dabowegofolokepezepataf.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/4322901946.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/nujetivupitidutomab.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/9495832058.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66d18decb---dijirafepopat.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/2573735921.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/28981687924.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4e055dec6337f78ab30eae8cb582a00f/xufasikigojamafovumusori.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a4b3587cbbda66038a86ab99e666cce6/mawepujetapoximugamoz.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/vowupotoriwuf.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/39bed3ee1c15802947f0912e696b3f34/22041963935.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/48954852687.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/robotevekumewivixokufa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098d00baf77a---6594028882.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6a1nhcjc4dmacdhf5374k2s5e1/60437317525.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6140fa95eb1322caecccd9bcb0ec521f/95408274706.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/linase.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nugikiposotenojazumekab.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_off0000c206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16632 bytes
SHA-256: 47a4332a5169238362ed6fde764cb71bed6f57818c49af6385be97c435fc0955
font_02_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 11148 bytes
SHA-256: d43702ae6ab69e169b7a5dbb062b888571655b4328d0e8a2f37dc689dffdb9f4

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