Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad7dc536eea3096…

MALICIOUS

PDF

85.3 KB Created: 2021-07-22 00:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bafa0a09b072a4b25b97a1ffc22d8f65 SHA-1: 1140428137333932fa0b6a5c78d232edc36e0793 SHA-256: 1ad7dc536eea3096385bc71bedfe6766a39a7f0c43529700e418f8788f3f160e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/5dr32rght9134ftfl1ja799ihj/kabuzika.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///84423845241.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/bumedodiwitedav.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/cfce4c41186a43bd89b135b0e2d741a8/ramutuxevak.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a51dce936---rezatin.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71fad26a33---xotipetunefedofofozet.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e0729538---vazofonexumuditojawilu.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/fekevapi.pdfIn PDF document text
    • http://prestopc.it/upload/file/73119128341.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/epvbpu78ouaichpejjo4f7oii5/fomururivukimodusafutewi.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/junamezelewevegapotegusi.pdfIn PDF document text
    • http://schokozentrale.de/idata/6690223683.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6fc7eda9052871b14aa369435afa08bf/65028756476.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/61337738139.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/58f2a42557a9ce712819d0f806b5ebbe/gijajunomavum.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/budulutosomorexo.pdfIn PDF document text
    • http://soles2walk.cz/data/file/bilisixela.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/luxuvulemaxubepokogamumo.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/7061152064.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df65b7a72e7---16251235529.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/54214417481.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/koponusobaweduk.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/30147546944.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/57663425885.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e8191653---binovasidulom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=today%27s+tv+jumble+answerPDF 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_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 10952 bytes
SHA-256: e3efe6c94af1c2ce8dbcd6a48d90b136e4cc7e9fe8c1e175b611758a94f27d9d
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 16916 bytes
SHA-256: 776d7442cf9dee405b62a2f43157fbc1b5cdae3cedc81263af5e6608865947fb
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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