Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ba19741e1a7b53…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 10:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de8da45abfea7829c6563491b91239ee SHA-1: b829b900d0e6179b7e0928120e60d304d66e731a SHA-256: b2ba19741e1a7b53f6414342a7d5b6b9061445c25d5a14f724e91f1fc27898f6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, which is a common tactic for malware distribution. Numerous URLs pointing to potentially compromised WordPress sites and disposable hosting further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/17359a0729b32a6931c0a993fba50edc/mosiw.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160778f903e464---24329809601.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/bajodonafewezepuzupumid.pdf
    • http://lab4050.com/upload/editor/file/90373728969.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f20bbd15---gepuwejajunigapijarom.pdf
    • http://westernmaki.com/uploads/files/widinovezexojone.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab29a459bb---suzadamozajumulor.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/ligedanidekidanoreru.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/nefisawopuliwufetuza.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea9e3b8ada---tewomaselojitekeguzizef.pdf
    • http://susanirvine.com/clients/82887/File/werufimilusinije.pdf
    • https://associazionedynamica.it/uploads/file/bumufe.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac687a72216---kotetubonewe.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160750311b88b6---36982182198.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6843208bcee94ca1eb41cee059e3c522/37819622731.pdf
    • http://pharmabiosolutions.com/filespath/files/20210819112702.pdf
    • http://ahcxdq.com/uploads/file/030252071227.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a4700316e5a2586851ac033906ad4a19/velilafakelegefitiner.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd849aee8---95944814304.pdf
    • https://cafesca.info/ckfinder/userfiles/files/vufoxamanatikovawuvef.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bdb12281b---97124831238.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/bixojitivexiwirajakudo.pdf
    • http://szkolka-wiercioch.pl/files/file/migiwujesefaresepaw.pdf
    • https://xo-sound.ru/userfiles/file/14261738182.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=como+unir+3+archivos+pdf+en+uno+solo+online
    • 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_off0000d7d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16792 bytes
font_01_sfnt_off0000efe9.bin
bfdc368d830b76d6ae6b379b486b5af0f9646abd43af75bf96e78e52c19a3b98
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 11156 bytes
font_02_sfnt_off000109d2.bin
eed24c9fe9b50bec3877893422bff8f4948a28793140d2187dda8b89ffcddfa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 18516 bytes