Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b9d8660f981ab9…

MALICIOUS

PDF

100.8 KB Created: 2021-09-06 14:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc36eac83c7c1850dddcf7e0de3c5250 SHA-1: 4a741766d5fbd77d37944f89e0e6487d691feb27 SHA-256: b3b9d8660f981ab950ce5f9d663fcd12310557afe03c6a8517a41b3363530e41
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://lws-realestate.com/userfiles/files/56407495585.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/zifujogojurimi.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/85375072890.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/rukifopexonidu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610247b8d5f67---gitorodoneruvevasobonokim.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6daed95971---bitutewowu.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/karimepejoxozadidivafugig.pdfIn PDF document text
    • http://fotossc.pl/_files/file/fewolute.pdfIn PDF document text
    • https://kawanmto.net/contents//files/93556836481.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/1038435795.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/bimexuperujudepelirufago.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ccvp7mgmt6urpmgq2cqord5nl2/xunalotegeki.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/nimemasinubogipo.pdfIn PDF document text
    • https://autopratichesas.it/file/mesenote.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160851b3c1761f---zavojukonenopisekugupoxu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/dc75f70d5eb1af0e90bd3f38a97b3538/refatefunuxoxitemupu.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ftu6qc8vabmetlpcvap53el8dg/lamisuwavoj.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/70a52f227d43518f1e837f05e72f67ab/xagoduka.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210618190910944.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/rufazi.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/df7748e2a10c29392f198bacfc7c2303/13601152073.pdfIn PDF document text
    • https://loctra.net/userfiles/file/74037409557.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b37c085eed3---28455109841.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/bukadosofav.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5350d51da8---xefokelovifig.pdfIn PDF document text
    • https://nexusmediation.nl/files/97206432107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=padre+gabriele+amorth+livros+pdfPDF link annotation
    • 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_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 21488 bytes
SHA-256: f10853623221692028b204c812b308ef04874d0407991d4b4f50c815e88bf7e3
font_01_sfnt_off0001538e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538E 11048 bytes
SHA-256: 2102d2ee5543a57f9ba432ee304a5c9b21a9f929016568bacb216cdf1ea1020d
font_02_sfnt_off00016cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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