Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe395ecbf046484…

MALICIOUS

PDF

76.8 KB Created: 2021-07-18 05:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af522d1916123a6ef4ab1aa7a5a1fd96 SHA-1: c6265399097b51ebcc95ef002ee3c4ed81b72e28 SHA-256: 4fe395ecbf0464843f666f1186e4e098133a771a038f4a5373d0b9de02176332
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF files hosted on a variety of domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of link farms on potentially compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://xn--80age2amlc.xn--80adxhks/pics/images/file/zunuxatuwij.pdf In PDF document text
    • http://dlt-nkp.com/fileupload//file/xafitajewowezad.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8e78b81a---lebamoxexufogelojixule.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/39319149125.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd26b7b4ed8---febogoralolekubopunuvoro.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/govesugeseturododaz.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/texudavosoninurebomusuwox.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/pejifa.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/noxamera.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/48577630575.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f9f91d20---tupivivudebubaguvotubej.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2ecdb98b439589050e39c711f5c10277/2560815743.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed93c39348c---bivalifi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ed536dc13b64d889b0f6ce1df307302e/19038781236.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/katakuxaxobitaluxamewexef.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1692e785---dibil.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607684394862a---dudufufirobotabaxufarogus.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e5214dddb1c4996ac393e8a0f429541a/11653762053.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/42235945036.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ts9ucm80sra9df1usk8mnl4od0/xekusekak.pdfIn PDF document text
    • https://mollis.rs//files/zafoterivubiwenunezivu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e09840488a3a30911a1a78661382776a/lorujilakin.pdfIn PDF document text
    • http://93564497.com/userfiles/nivabonebuxob.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088b948b988f---zudafosisidufasalo.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/32250291399.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/19572408493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=commercial+partners+realtyPDF 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_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 10680 bytes
SHA-256: 48c775f59eda5030aef4dac70d052ab7dd180f125719d7a6a58d8a6e89ff028a
font_01_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 17488 bytes
SHA-256: 5ba803f443b52ef9e3d93909ca911d886ad29e82fa38b4cfcfb72f707c1638be
font_02_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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