Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169df63a81da9ca…

MALICIOUS

PDF

94.2 KB Created: 2021-08-14 17:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23c9270320e482a592912adb537b4038 SHA-1: 939a150b231106a14309b50571e48e9ec831a22c SHA-256: 4169df63a81da9ca95f25e9cfef7329d74fc0c5b52b7d4379770702ac1138885
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple compromised websites hosted on disposable or potentially compromised infrastructure. The PDF document itself contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4108

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 http://deshdunya.com/blogimage/file/14926819179.pdf In PDF document text
    • http://ricarda-allegra.de/userfiles/file/89454592964.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778847ce971---90388772717.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/61615878188.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/2c44a14hes5c9pibrfgjanom93/zerotefejuxunikujadapilu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/72962480287.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adacade45f---newubi.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/77802002547.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/obpmi8qa2cq9p1e90v85n3ir67/fadupenomisibajoliwiluzib.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/32838382800.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/6106929770.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/topr3873a36ndlnkvalqestat7/gasanigona.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/dc500dc03f4567e11770f934f8d6cbb3/17636797293.pdfIn PDF document text
    • http://mp-journal.com/media/file/93081007765.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/88f76f6891f05e78e9fdc50af7349b64/sefew.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc36c43d82---34030772123.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/43560136225.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/h33kf7dg3egp3u8cf2h38rdk48/didod.pdfIn PDF document text
    • https://bioesteticaonline.it/file/78869729998.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forawomefete.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107240208378874.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fbc79fb17525e191517574a8497c0ac2/gipufopipatitato.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4b1bed92d4044a99cc13600394ba9142/pijol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=customary+units+of+capacity+worksheets+3rd+gradePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 18540 bytes
SHA-256: 4716b76d61ef3013e7e3687f1e54d424047149391aab523d98d0559b701a8e9e
font_01_sfnt_off000160c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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