Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2c007d62625717…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 14:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18e940433577cd7744de58daad7996b0 SHA-1: 6348b8dacf356a6ac2e462f954df732805c61820 SHA-256: fa2c007d62625717bb66efafd4c2c8caf43adb81d37a44c253d832b5993a4fae
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://daiichilogistics.com/uploads/news_file/nufedikalelosanelewininon.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/49214850137.pdf
    • http://studiolorenzino.eu/userfiles/files/katuwatobidekozutugivajum.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136bafa48208---zakoreta.pdf
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/30776674921.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/zasozerurazojalonojisun.pdf
    • http://birizgardenhotel.com/userfiles/file/9924041269.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/52154103284.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f2a03fc9---77276216494.pdf
    • http://thangmayedex.com/webroot/img/files/67594207472.pdf
    • http://hangnhatbanonline.com/upload/files/namapawexamawatunisirobej.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2eaaa5af---salag.pdf
    • http://kes.org/upload/editor/files/14984556789.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa64ddbcef---luwepegigategazux.pdf
    • https://petek.biz/resimler/files/vuxirumadu.pdf
    • http://pospatrans.cz/UserFiles/File/zuvobufuxetiwemutatibapa.pdf
    • http://hyunshin.net/userfiles/file/dofurunikelumemidumo.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161306d3c5cfd0---numudajabubepafixilotu.pdf
    • https://majubesar.info/contents/files/jugurefulag.pdf
    • http://fittbikese.hu/files/file/fewin.pdf
    • http://el-system.jp/uploads/2012/files/xelasavujepebiminubef.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/59887743793.pdf
    • http://hzeiger.com/userfiles/file/3875710889.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sdvkfsofav0knb4bhc0cmmd73q/giremaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+porn+tube
    • 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_off0000de5a.bin
06f9628ef450755520b246523693ae514fa51d90307372c4d1f4438b327c8d48
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 17752 bytes
font_01_sfnt_off00010bc5.bin
cf01afba41cfa0d59e3250b7e9d49d55a6721b4fdc4c84566e6ae6add9027bcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 10228 bytes
font_02_sfnt_off00012298.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 16792 bytes