Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eac3e263fc0761b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 06:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccd866e0dd2eaabf533d21b718dc7364 SHA-1: 121827a42e45314c2116ac6f2b531be7eb6dab47 SHA-256: 6eac3e263fc0761b87f08e90345e7482fb7d9c735a3231f2ae30e02624880808
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pass38.com/images/contentimages/files/43282314938.pdf
    • http://lmtechsolution.com/userfiles/gusisolalozusomil.pdf
    • https://h16hr15k-h19hr37urn.com/contents/files/bojej.pdf
    • http://carshopm.com/js/upload/files/83513395418.pdf
    • http://bmcnx.com/userfiles/file/lowuve.pdf
    • http://bud-med.eu/userfiles/file/95520584048.pdf
    • http://krakowska98.com/zdjecia/fck/file/lejesixe.pdf
    • https://5a.ro/ckfinder/userfiles/files/48625629851.pdf
    • http://crmrealty360degree.in/userfiles/file/bimofonugeburib.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/366962570ad4ccacfa7e2f3ee753d4b7/bigiwalijokinajomufajin.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/nefopoxawenebagelog.pdf
    • https://mokhalasati.com/userfiles/files/ridosavizivojitirusulune.pdf
    • http://e-park.es/img/uploads/files/3128609552.pdf
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/lajenilanatob.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/96605426967.pdf
    • http://fanti-fitness.pl/uploads/assets/file/63495869094.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vajabumozafulosif.pdf
    • http://www.ondebiz.com/userfiles/file/86364582979.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9217e83db9aef13207b9f6c4631508e5/59531137731.pdf
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bixopiwumelavusosenarire.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/jazegareju.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gubizevasujunira.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8daae67b0---43251686910.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/busuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=install+keyboard+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e232.bin
affbbfe1f8a8a750c57b3112e8ba8f399f171d0ef7cdd587f54bd496fd1c5602
pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 10540 bytes
font_01_sfnt_off0000fa53.bin
cdd04e7c070967293fc6e74af8391acb43e033300ad02498eb708242fbda89b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 17952 bytes
font_02_sfnt_off00012931.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 16792 bytes