Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f855db445c7ae3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 06:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b9131070b0b52660571e502fdaa0b839 SHA-1: 03ae153b73ef402f54733b24f07acfce1f2c5eb0 SHA-256: 44f855db445c7ae3679ffd2abd13767f75a258d3dd8e837a64309ab3f632553e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1312e37491---xabudevusuxi.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7d467f8c---18778326936.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/9544786041.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/vejuketevoduzaxigomegolo.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/mozojiruve.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/98635565068.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/82c93c7ad698c54a08003b69ed4349e7/dafetasolufebuxeze.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ac2008b7---76214588730.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/an2796d7qrvssp8sn89a5qhd95/zaruzitemuniwudap.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/tozurexawiwalujidudejub.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/nemilogasotowawage.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b706735a---barekumepabozovulipobif.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb8b6bd53b---98823151183.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f122e2e4---76637513614.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/11371183494.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/fununajikometizujajuto.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/tuxivujokigisufilemezoxa.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/zawuvebekotaloteb.pdfIn PDF document text
    • https://red-adlay.com/upload/files/fejaworov.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717ac1b1cec---ditupoji.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1i060jkqodh11kfabdp9d00rjt/lawipezezed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=2008+honda+pilot+repair+manual+pdfPDF link annotation
    • 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_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 11048 bytes
SHA-256: f24fcaeb96a17e47ea2a26f49fad8a0fa2112ec497734db1922e0fdc27579ae0
font_01_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 16736 bytes
SHA-256: fb3e8395561a292ba8cd4d4c4d09eb8f691079497a250e2eeab68c46ef1baba4
font_02_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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