Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b8d6b941c398ca…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 22:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa86afef4d62f0b60074e862b456ceb3 SHA-1: 55fd9434d60d4fefea8a9f97a0cd402b8d07bd5a SHA-256: e0b8d6b941c398cae33b82b66297d382c02d51d63c16065d42260f1bf5160524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://agro-pasz.pl/ckfinder/userfiles/files/bitoberisaxojoju.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/71382040686.pdf
    • https://planet-pvc.com/upload/files/vufij.pdf
    • http://patanamachine.com/imgUpload/files/nigukobirotinosajon.pdf
    • https://tresonance.org/uploadfiles/80683840839.pdf
    • http://eclickapps.in/userfiles/files/wevutewevuxet.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb01a887a9---nageguxolud.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/79473992722.pdf
    • http://elsekmont.eu/userfiles/file/pifolalivibatemi.pdf
    • http://asiavent.com/UserFiles/file///boxulokuviwi.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zazabuxubewur.pdf
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210702144138.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/71566397804.pdf
    • http://zatoodesign.com/userfiles/files/woxubiw.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607191f3d58aa---mikolopasunuxukorewujawos.pdf
    • https://observatoire-omic.org/documents/file/rizukarilukofarakizufefo.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/sobesivu.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abda89dfaf0---10410117290.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160868b852274b---dowegabifuworigaxorin.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210716_060515.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7fjq68e19a3vak96s76cpo69vg/tolewutawilamukuvi.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5e1ae434---sixefusum.pdf
    • https://charterboatdeliverance.com/uploads/files/38790646069.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/89786184719.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+sheet+music+pdf+imslp
    • 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_off0000cc58.bin
debd9b82169810185d2f827c12c8ed7cb1565d2c6eef96bced4ed54dc56087b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 10576 bytes
font_01_sfnt_off0000e471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 16792 bytes
font_02_sfnt_off0000fc83.bin
97814e9db8db6c53e64a3952ee28dba7683f60486c41e36f180e510201001483
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 17592 bytes