Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57184db5bb86686…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 02:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af83558416affed74003e3e662568c78 SHA-1: dae0b3696638cc25a63773969761ae3cdc63deee SHA-256: e57184db5bb86686b8cc60e3071591d9efd452d1e58e6311b091e6bac406e08c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely lead to further malicious content, such as phishing pages or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7589

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f6e93d03---nudumozado.pdf In PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/40136010408.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/5604299489.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/gorasijipowabalupo.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210731161547.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/nujexotogibekazozatagerax.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a74e5aea4dcd635d9067c56fcb572bb4/wolami.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c4d91a51---siwirigarugerireki.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/836d2664f7af0eb77070d947093a0186/goliteliliditeke.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdm2r9vnbmnh2uku7hojha188b/gaxalesokore.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/dutofif.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/zominul.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/26443936690.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fea7a7c965683343751f2781893b7896/43870241296.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/72383541641.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210827060507.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kaamrisjqqb022cj1artvtd8dl/bogiwevuxud.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/sevefaxezemovizirale.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bafcfa8a9b2---ridutozuj.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f4a07926---14784396557.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31d2a8074---8632748816.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6385e4bd---zamejopujebejo.pdfIn PDF document text
    • https://digireg.org/upload/fekijovapewopuzanofu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/16132f4f5e10f676cf4a9df884cfc5c8/fosilabefin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wbbse+class+10+physical+science+book+pdf+downloadPDF link annotation
    • 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 19560 bytes
SHA-256: 3b8d3ff84736deb0e27e2036c833f931c70724ee54a8e6830aa3270a4e3c619d
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 11116 bytes
SHA-256: 608ece88826211042e3cf8fb1adec952c14ea836f8831549e1810eab2f3bb8b3