Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84d1ed800fa855c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 10:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4229df2c966713ed6c7ce9d4dd35af2a SHA-1: 737d3284df23ee2c93967c581a54ef5ef7e3834b SHA-256: c84d1ed800fa855c25bfe712495249c41d053bc6530ce8322c421c97a6c87259
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6500

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://allytemp.ru/uplcv?utm_term=meilleures+applications+sonneries+android PDF link annotation
    • http://lianbang123.com/uploads/files/202109021403443055.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvatawivumokobeni.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/dodovoviragapuwulowodafek.pdfIn PDF document text
    • http://electric-kernbichler.at/53727953120.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/83270417329.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613558e67324a---59980092560.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/sukabozowedevesazu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014c601e33---94797578255.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/sesakitawabepavojovegusog.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/20706191526.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/digedapafada.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/jilerefelabim.pdfIn PDF document text
    • http://e-district.org/userfiles/file/bukobip.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/1989019210.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091617020499.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210914_9A800371D95C27E9.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/56407344046.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/71743589103.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/61112322893.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/romuroxigagiwetose.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_204754.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c292e38a5d30d98a3f40ae0819fd32ff/37217776430.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/labulumavi.pdfIn PDF document text
    • http://harlit.com/upfiles/file/xenaxesisakofuriz.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/58964136755.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/54894458158.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/pejopofugugalur.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/90569489373.pdfIn 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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 17416 bytes
SHA-256: f0e21dfa02df073c9f4840b6ba57f9386e5fec343c387822136f8f009be883ee
font_02_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10600 bytes
SHA-256: 111f44128692556f9d2ac9c5baf09389a1875e858926ba4b720ee66837ba65a6

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