Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4a63e31ad48640…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: adbdf1a2bfbce83c66163a7b5219188b SHA-1: b42ec237e22192d44d298799d3a0214b555dcccc SHA-256: 5e4a63e31ad48640967bb6fbd1e4e80722fa78caaadf697fd00ec1bf47c4781a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://cupanghitam.com/contents//files/62059764023.pdf In PDF document text
    • http://muntepa.com/userfiles/files/43836451940.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/jiwijezasebep.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c04386d8460---3356907423.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lg6aa31l8l82p28v2fpmpq7uk2/80346010447.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/42a59c847a1979bec4fde810adb9c18e/rapubumipuwazo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c99dda4fd---4586227327.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fvs5dfd5krr9peea114gmnocka/noxekimafilefazurelo.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/32880610391.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/rumureka.pdfIn PDF document text
    • http://budka39.ru/files/sebaroxuwevupexufegodovoz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/08af6eecc5945221eaf9bed74efbaf66/wawofifajepif.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/36e0b2dc5e94940cb7d614543895efd7/66578124225.pdfIn PDF document text
    • http://qdjshg.com/files/file/48212692733.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210629105447_2j7bgb.pdfIn PDF document text
    • http://rhondachem.com/d/files/66196572837.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/jimafuwegule.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/kesebizojiwuvopizatitar.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davabeluxivabo.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/dipupi.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/27350540026.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d59fc8552dc2fc7796066dd4958843df/86514879417.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/67412982629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=boori+sleigh+cot+manualPDF 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_off0000b750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB750 10828 bytes
SHA-256: 0d3fb4cbfd96f6f1332222801af0cb4dbd188bf094e0234b24ad12e6a72ebebb
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 16284 bytes
SHA-256: 98d2156993cd9c41a0b96b0c5dda3019e8553c6095ef9f1ce693f891ecebeb27
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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