Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbb91c5717709ff…

MALICIOUS

PDF

106.0 KB Created: 2021-06-25 21:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfb0b732393d125a9f84891aae9aee76 SHA-1: 3b972a990fc8fb46acb9ad62bd0e7cc2a897358c SHA-256: dbbb91c5717709ffadc2c8c88c1995b761bd625f27cab0f73d0f5abef96968a0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information. Numerous URLs are present, many pointing to compromised CMS upload directories, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://teckim.it/themes/userfiles//files/lemexiwawivopezinizeliga.pdf
    • http://www.cerathai.com/image/upload/File/vigowupa.pdf
    • http://bafiti.com/sklep/userfiles/file/89355385727.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nqmkajuodrhe5v6g6gpp8285db/vavalojobefinepuwiba.pdf
    • http://learnazia.com/fck/imagesfile/15400499690.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d06c944d---54239652444.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d4a4eab32454229851cf15eb8d245075/sirimudaka.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a852938f356---6667972360.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16096b56ba5eda---somemisoxobibumafaxu.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5277c33ff2f5dd988c92fdac062a1633/38787326382.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/56p4kjlug1v20t1jghcjppj7o1/tixovug.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5d405779eaaef19cfce74c9aab6072a3/7639850145.pdf
    • https://dm288.com/slicice/file/sakidowagadatiw.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d276692acd---datemuzuxir.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c325792e4a1---38375258234.pdf
    • https://bedandbreakfastchia.it/userfiles/file/domazifenemomixop.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xijakufux.pdf
    • https://ketdoanbus.com/webroot/img/files/sakekojaruvotuvigu.pdf
    • http://fenotropil.ru/userfiles/file/92895829275.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6499bbcfb---34615002236.pdf
    • http://accronline.com/userfiles/file/karupal.pdf
    • http://fitviewer.de/files/file/muxavepopidanobudes.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b20a563e819---malejizuwalenem.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/7a22e5993fa36b87e0e7535f7e5e026b/nogeganuxopijagemo.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210605122929_360272423.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/gefavaxadi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=strength+and+conditioning+nutrition
    • 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_off00013a68.bin
c53bea4832582c0f4699cbb5c4ecdd23d2705570479e5d5ada85f22f3bdcb738
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A68 10608 bytes
font_01_sfnt_off00015261.bin
206e594d4f264cf5be0142b3287a24b15b9ac3939a6625383b8b84db56b7af9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 18036 bytes
font_02_sfnt_off000180ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x180AD 16792 bytes