Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78d1cec8a9b6202…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 21:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3d43f343ee4c684ff0c80112baabe07 SHA-1: fdef63e27272b6d732398d4a5ac9fb1fe6c545b8 SHA-256: a78d1cec8a9b6202e5c498444fd324f92242d48f027c6ca4f137efa04b9eb97c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. One notable URL points to a compromised WordPress upload directory, suggesting a potential distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nsaimmigration.com/userfiles/file/81432677177.pdf In PDF document text
    • https://zagorjeadventureteam.hr/files/dubiwiwixujem.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/gukesewujubiw.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57860680797.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368fbbbd7e9---94425662437.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/kumujufulidilevo.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163084023528754285851.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/dixuke.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/jetoporelizebus.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/3302552612.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/70316669147.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/21271124188.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/seninaxuzopesujere.pdfIn PDF document text
    • http://elskenecologie.nl/files/pasadutesiguwo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/33945206203.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e9ab40dddf09b8d10742488bb25771aa/pasetikewuxo.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917105907131.pdfIn PDF document text
    • http://www.moyekolodin.com/files/betudi.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/55856739201.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/89885720499.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8c9a17333cfdba2e0b43dd3f49ec098f/xotedupoxugotuvumonut.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/liserixoxawoxenaxerag.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/zewakuziz.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/981addd4928cff7a901ab18e9473adc1/wotuvefurujozajevovuj.pdfIn PDF document text
    • http://snft.ro/media/file/rofoxamonuvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=file+recovery+recover+deleted+files+apkPDF 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_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10760 bytes
SHA-256: 9d871abca8c6ee31bfe1ddc0940be22df82c240cbaafd6abef8c177b7670d190
font_01_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 17988 bytes
SHA-256: 52fdc13ede352a90de83ccb86dc4c5db1b204aa2fb5213e0b13e9ea38b379199

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