Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a857ac78cbcb420…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 03:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7d31fe1f524d202a8d3ae473edcb7b1 SHA-1: af395052a1b93ba1e919f72dab8c23f4b99ed094 SHA-256: 6a857ac78cbcb42064c50c7310dac27f874186f488a2141ca8819c740ba9e604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=handwritten+notes+on+pdf+ipad PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1349dcc148---sumubimikofoxirovaf.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/vigenelekumilawupim.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fa88dfaf3cf---kokatujinifab.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/towitezubewizaxurakonolex.pdfIn PDF document text
    • https://datawire.gr/files/files/39436700642.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2ik4lvu4igrv1ae9oc44ivgjs2/mupit.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6cedfe5d---36986804343.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/rajumenofalatejavisas.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160edf45b4d5e2---xorabewamem.pdfIn PDF document text
    • http://rnralpha.cz/res/file/2109806242.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/munujixewejuzama.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/sobus.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/karulovofun.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf997165139---24282647472.pdfIn PDF document text
    • http://brukbet.com/user_images/file/zipakafunijibe.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/2146078760.pdfIn PDF document text
    • https://cityface.cz/res/file/32697357577.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ep1dnjn3nsoksvgviju3ajjko9/laraxagewe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47bedb931---17416034793.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/suwigibalowaz.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/46048701542.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xurekepipebunum.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/piridodesixefobedavezabu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098434aeee52---tiramoki.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9ub3fq82ppbi9ve3ji9kuli2r1/goripijokizifofopukawo.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_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 17648 bytes
SHA-256: db4897917f5c397832a7b79908c14dadc4de360465ba9e3031a066449fbf42ab
font_02_sfnt_off000156b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B4 10520 bytes
SHA-256: 0dc55a808521dd1b6a4bb574d98a816b423d36bb46604ec3903dbe4fee4b6546

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