Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bb64a15313b666…

MALICIOUS

PDF

74.4 KB Created: 2021-11-13 09:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64cc9d20c3ebe991bbbc3ef73e785a86 SHA-1: 2d99b1c8e729bd24845ae0c9e413b09cce1a5012 SHA-256: 43bb64a15313b666544a19efcccc35b110cdeee3b1a215a35fe7d49b394b7757
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=how+many+inches+in+a+half+mile PDF link annotation
    • https://institutdesante.org/userfiles/file/netiretosuserumufogikuwok.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/95796205029.pdfIn PDF document text
    • http://01host.ru/userfiles/files/25991758240.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomamunekoxaga.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1617cc399efbc4---36692828338.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/48103333359.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/47431815304.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e3dd554367c5b20973077a214b60d7d8/62470537357.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/klc7bp9hrqpe3tb9qftfoevmgm/gebokofipekalarofikiloso.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be01327cdd---wolowogaluvarevezaxe.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/32567833223.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/39837673732.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/38034515468.pdfIn PDF document text
    • http://sartor.ru/upload/files/53664889885.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/xasitededujitomajorum.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/zipuvavarimuziwebemo.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/mevufif.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xivaximaxiludot.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/nujalewubasevazajiburij.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/21289198940.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/xubuxovigemeroribisironi.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/94902406815.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/vilozukujiradelel.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/puwupudijisebiwesikila.pdfIn PDF document text
    • 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_off0000bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7A 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 17660 bytes
SHA-256: b2daee3440378e29e77df612bd5d54a3b2968b0a08f87313ccfd86eca42f74c6
font_02_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 10596 bytes
SHA-256: cfd3fc4cbbbddddb9970b83e39ecfadc754f4cc1971a53d3d0d808cb2ccaa227