Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b5870373900e4d…

MALICIOUS

PDF

91.7 KB Created: 2021-07-14 03:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2668947c4a7da091a596b47429ce3862 SHA-1: ff7072dd284aca17e901a24e4b26ad7ab3c448d7 SHA-256: b7b5870373900e4d0c47692c4a9b42368165b51f9253ea5450efa70c4bc05aca
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm pointing to compromised WordPress sites, likely serving as a lure for advance-fee scams. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and numerous embedded URLs point to a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/f97bc22e5e4b80ff0bc904f7f83401f3/ridemomimosotozumukosif.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5893674d1---kuvavegezaro.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/904f4efeac8bcfbc9e02e7c4b41db3a4/75523495278.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lla9f90lqsqgobd0fetbe8g765/wulokeramuxejo.pdf
    • http://bigredclassof1960.com/clients/879476/File/podogosulufowobonupe.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cf7fbee4d---92294221307.pdf
    • http://nensi.si/upload/file/11928958596.pdf
    • http://ankamet.com/userfiles/file/24383261647.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a543d5d6f9f---52045605207.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092188e08e06---fikugesok.pdf
    • https://atcotourismtravel.com/userfiles/file/nivulogasiruwenibetaz.pdf
    • https://aplusadvance.com/naver_editor/data/file/96471177377.pdf
    • http://asea-admin.com/_userfiles/file/20210503062425.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf74b8ab5---pejutagejoxaluse.pdf
    • https://aulacvn.com/upload/fck/file/10092138372.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a3072927---20441742687.pdf
    • http://yljx.cn/images/upload/File/41131477783.pdf
    • http://ladue69.com/clients/876446/File/3765325541.pdf
    • http://ampletrekking.com/userfiles/file/30688953639.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d4c84283---sesojasitin.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3a628f99103dc00a10bee5ca93c31f7/jedob.pdf
    • http://cnc-soustruzeni.cz/files/file/lifadaduzafela.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fd40f84efbc2186d99fce70813356626/30843578140.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d452050a650---bipesexulefutofe.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6533adbd---30840830815.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/31b728ac238e765ed254bd696515d36b/jofugoviseko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=average+cost+of+cystectomy
    • 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_off00010232.bin
4222e58d3822f8f93a53479ece4c7eab7e249d29af2cb23cdaed21bdee29c85a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 18096 bytes
font_01_sfnt_off000130fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 16792 bytes
font_02_sfnt_off00014913.bin
4795275baedf181b6e639d92a60f31ac8b1e22f998e518589018971b194ab2b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14913 10596 bytes