Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6c16aac90a01d6…

MALICIOUS

PDF

129.5 KB Created: 2021-07-03 14:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc2d1a0a2609f014cf2d4c51152f3d2e SHA-1: 4500f90d4a5e1377970f99035f5dd7ee284ce8d8 SHA-256: 5f6c16aac90a01d6e9f7c85fa1223cb22fb04a90c48f0bf152370803c02dca24
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbae52e7e2---13017950022.pdf
    • http://tpdw.pl/userfiles/file/92959813454.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/1d2fc94a56881d862811f4dda450eb6d/21050480574.pdf
    • https://menu2uplus.com/images/file/77360811764.pdf
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/87419804440.pdf
    • http://4seasonstours.in/userfiles/file/larolosepeputuv.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/91b30fa661c37878792f6e787726550b/28868452334.pdf
    • http://maxidmum.com/images/upload/fck/file/67901584594.pdf
    • http://chaitraglaze.com/uploads/kususipedupupemutajales.pdf
    • http://7onseventh.org/clients/868256/File/mubagerapevoxiwalawuju.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd042f388df---10266157686.pdf
    • http://polloricowings.com/uploads/files/vunalogimafivami.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91ad62a113---57937696558.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/66c271a05f6987cd6bd00e4b1a657102/40994456328.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609cda83e46d1---vuvog.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d538a707---xegilira.pdf
    • http://asesorgubernamental.com/images/file/90362422868.pdf
    • https://ambulatorioveterinariosismondi.eu/file/55057821293.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4545d3ae76---31739770799.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839d1aa8705---zatazu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/k0329q5ugceolpp6koks5q08ne/resix.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609941f343520---19830533044.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/665e405c1edc20617eb76938ec571aac/24281623511.pdf
    • http://armanetti.com/images/kutev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+crusades+were
    • 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_off00019ce9.bin
0b300166c628fa320217d97157a13dcf38a0bf30d0ced177beac01dee2447b55
pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE9 10156 bytes
font_01_sfnt_off0001b3cf.bin
78e34d57433a0441740677aed5918e3777a6783e469e61e53b6cc673f3e2c548
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3CF 17548 bytes
font_02_sfnt_off0001e0e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0E1 16792 bytes