Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1c836048d97951…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 02:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76490f392c529c875baa9f3b3730cf48 SHA-1: 54f9dc15475613c903623efafb649a034a475554 SHA-256: 7e1c836048d97951c5b0db41b89e3375b6f112286786fb72f80532143ea329ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://asja-doll.ru/userfiles/file/zeneluvulolibafifuz.pdf In PDF document text
    • http://qapoll.com/2015/vat/upload/files/lotuwawozo.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109050510125544.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/muvavelimiroje.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/tekidapurizipesifawupuguw.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/24863686982.pdfIn PDF document text
    • https://businesslife.com/content/file/88393599029.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613946eb2a6e8---43541980496.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/75193668631.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/76152933479.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/98341269713.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/lexunatumoga.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/sebosijo.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/82079761418.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/6038153494.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/93475110803.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/pobaxiligi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0aed4957---sipuwamuwepulozimegoxiga.pdfIn PDF document text
    • http://tayles.com/uploaded/53030615370.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/zopetaralegepe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/abi4tebvkpi0v66o2avu461rq9/78718724149.pdfIn PDF document text
    • http://vucert.vn/uploads/files/sorojenadexofipifuka.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/jekenexitisuromuzakarir.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905c4b2b9a---63041862585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=three+gorges+mapPDF 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_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 10324 bytes
SHA-256: 57f0e7659f60ed5ec8980dc144a6882c7d18d353da2697dc2247fec584cc191d
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 16872 bytes
SHA-256: 746269ee76b247a1f5a3e2a689a4053cd4096154862a468f5e8e5d687cead73c

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