Malicious PDF — malware analysis report

Static analysis result for SHA-256 787a82c68fa9dbdc…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 09:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f16b2226562b3ef4b43d1e107095a24f SHA-1: aab395c3b8a22f3560ce6e288404f2ca0da0196a SHA-256: 787a82c68fa9dbdc1db64c23ff45cd4409f03b5277d99cc7b7b88b7671407019
156 Risk Score

Malware Insights

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

The PDF file 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 compromised WordPress sites. These links likely serve as a lure to direct users to phishing pages or download further malicious content.

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 https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/69d35d389c883acc09d55023dd7c71f6/6679051761.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xukomixapalumedeles.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/59470508287.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/wuvuvamiwupobefufopam.pdfIn PDF document text
    • http://amandamaitland.com/images/file/firowob.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/e8b0a519b358f79e4439d66bed1e4475/76902283719.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/mijilopawobixo.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/71670374705.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/gojomitozibimuwuzopiki.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b46b04a4---xodekizexirizo.pdfIn PDF document text
    • https://ebooksweb.net/files/file/nubedifoxurafe.pdfIn PDF document text
    • https://anup.bo/images/files/xefotelojav.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gm7sae372vpl0qslo9507fjjku/parunuvogerimu.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/bapakoxevaragarumo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1813a81520ff26142b6fbfd322ed19fd/wesiledipizovudoseni.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/sivitiwiweboxu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5c599a835220175c42e3d07faf2a935a/dewazixukujutifozezitaw.pdfIn PDF document text
    • http://amdind.com/userfiles/file/52027266090.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/23601228137.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094981c4e78d.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/32905071317.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/kenoro.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f000b7cf96---25202991615.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/79725154196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=anatomy+and+physiology+body+regions+worksheetPDF 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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 17684 bytes
SHA-256: 72966ce413ea813dbecfd97c90804aed310b27b4c481458b1b771a9afe296d88
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 11252 bytes
SHA-256: 004544dbf71ff9554d602a145bce10b56a497f88079a0c178045d9fcceb12348
font_02_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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