Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3e644d22aeae5a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 07:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed23ed0bd41f526f18d6ff586ac8d2d7 SHA-1: bdd7b88204ac8919012399150e9fdfe58b7084c2 SHA-256: 4a3e644d22aeae5aaa255bfa27e3429c444ff973c7906aa37f452358cf23ad9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nutricount.cz/UserFiles/File/22383817320.pdf In PDF document text
    • https://oancora.com/ckfinder/files/42757812365.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/77753299103.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/baguxomuruwiwamuxilugow.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/lirugokototaw.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/xijazibujipepujipuzazowud.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/46036664990.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7d9eef9c---96115142124.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/10288756434.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/54501514622.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/wujuxaberolasexolebojal.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210913_69C59B87D7EB9100.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/likadelogogudikajukil.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xirajufitukutadumalawabir.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/gakexarilepasida.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9a0js9c4viantrit3c1k4i85j4/situpo.pdfIn PDF document text
    • http://kme-kme.cz/files/file/fenilosizimizodima.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/tejowabovotuseditejebu.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/26735957909.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72ad191781296b2cf25dd00623749a2b/44307205115.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/24794552551.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/varosewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bigg+boss+telugu+2+contestantsPDF 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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 18244 bytes
SHA-256: da0eeb601801e6e4782fd36078acb50f402f19a53522a56b2c80ad148030b5e9
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 10720 bytes
SHA-256: bf1e262c73609649d729a0b01c723cd7a8db75cfd7c2f851f814eed068eee94b