Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ce5b1bc10f12c3…

MALICIOUS

PDF

84.6 KB Created: 2021-06-17 09:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: de79354cd676e1b12d2f884cba3dc314 SHA-1: 9aba5461a72252189c585ef725607e72d26d138c SHA-256: 92ce5b1bc10f12c3eeecfd25ee7d25e8613bd0f3715015656c2f026f49b23b5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or scam document. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title about calculating voltage, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8482

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=how+to+calculate+voltage+across+a+resistor PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/57437140810.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609866449f7d9---jubenemajiwogosesuligufi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080746240357---gebozurofegabonokelikiwo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3b89e7f98fbbe90a1592d6fd2fa5a6f0/dopegaruputupumewinulu.pdfIn PDF document text
    • https://luminex.pl/upload/file/vavawazikixap.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/77524340250.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5bb59c9d---70722203115.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36d8ca1cb---37613369340.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/38399378020.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aaf448896---84265527719.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/busofi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/wumupetegabexofipum.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e81531d89f56ac7bd509b2afeae0943a/ropodatazutokamul.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/zakaziw.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/fef29a4ef9e8cfadbab041195a16ef4e/87230790165.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ru43rllb3bn66qgot0162oq8cl/vowodesi.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f7a9292092f96655db7ea9af52386ae3/fakotovitoxef.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/domakataraxipenabopexe.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3ruqloqbvkvb7ht2p257ucigcm/65408550802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014db2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14DB2 1180 bytes
SHA-256: 79f48f43c79a1a4e6d27f0d4a833743efee647c5ede715636b574afc2f079362
font_00_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 5568 bytes
SHA-256: f7c25603b153ca21f13cef1273584ec63b94291ca5b8b3d18e3263ea83db002e
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 5080 bytes
SHA-256: 53e321b8fe1a403b7fd3987655d9669cf31cca717219dee6c45aa90647a26742
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 13668 bytes
SHA-256: cb5d1c4cad75684e1f43b3ed6753e21d47c0b104582467fdb01b269a7958ac41

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