Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1a91ea4e0039bf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 14:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 794bf0446b765a2564508ec11c8b9f86 SHA-1: 82410141acbe874e675334c9f282d1596c7cfba8 SHA-256: 3a1a91ea4e0039bf93d0a35d5a642c6f3701c712e9ff8164407f2a1aa6f05af7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://processwork.archerhuang.com/ConImg/files/82292439297.pdf In PDF document text
    • https://gencerenerji.com/resimler/files/11446999915.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/bamogiremililixixisam.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nukobavusig.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/tiviv.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/gudevuw.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/9115285501.pdfIn PDF document text
    • http://shen-su.eu/gfx/userfiles/files/59202870489.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc8fe2f12---47571892646.pdfIn PDF document text
    • https://dcimx.com/files/16789841100.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/91505232103.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132667a6a827---43900880662.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/kenifetexusoruluxomino.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/jobobuvokebakosibesuzuxam.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/jivobumiperoporabuvelew.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/82969016480.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d98a1360---nidobusevat.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wimusawogiza.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jesosejim.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/29579366973.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/85601350607.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/tenovuwada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ipod+touch+4th+generation+androidPDF 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_off0000bc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 10708 bytes
SHA-256: 29b62743d8cb3f1aa092535fa70692e5faa91335f6952d16e86b4b1e05c8703e
font_02_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 19032 bytes
SHA-256: b1144b1fd80e2d5ed07bb33da3d7fbc7534c2196c3a335af29f3c634060b614b