Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e849ea769ccfda…

MALICIOUS

PDF

103.5 KB Created: 2021-09-07 23:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 567447a186d248f88d4c732c7dbda77d SHA-1: 1d09c48d5b953ea491c870a8c06f8342c296d261 SHA-256: 22e849ea769ccfda7102336cc1ffcdb17a804954de42043c0d409c8c084c9789
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 links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://imi.vc/upload/files/938650782.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8266a38882---nifefagogujegawur.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/kirakaxewekewi.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/40791582913.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/35955608749.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/jinapuxevusika.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e907b31b82---21006237253.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/20130234569.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e12b0ca0---12977305296.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608f598ea305b---6801282553.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/85144963377.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/45286950658.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/daworetapazavanidugojukug.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xufinanuxurapep.pdfIn PDF document text
    • https://dietacud.eu/upload/file/96042465227.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/fuxuzemata.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/buxeresenumok.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810808b0a09---10588832033.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a34b40608---subometukajifijugujefoveg.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/notamozuvegurebega.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29cc3f284f---nudil.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/97391308903.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p4pcjhqlr4ojmq0b1uf1q643pi/zedekikufopubevobuwitegi.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/sejinawejofuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lease+agreement+for+rental+property+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_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001442e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442E 19532 bytes
SHA-256: df81548ba3a70cda9097b566fd2af9edaffc3771daf7adcdbaf343c4719a1c2a
font_02_sfnt_off00017736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17736 10820 bytes
SHA-256: 044f262dfb1f91580f8733e24c266c81753d8a789940769a05c913982a5e89b3