Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e86179ad47182be…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 05:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 96ba7a7bf1f0e3769ba99e78f4d1a040 SHA-1: 069686afe9d8bb0d23c2ffd2738ccc51ef8eeb24 SHA-256: 4e86179ad47182be84d1a289e8f61e21dbb1825f4e05e915ed040f23621cf92a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, with several hosted on compromised WordPress upload directories. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://feg.vn/uploads/files/diravibugudideras.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/mazuxejonafupukalitug.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/bogaviguvagafetokezitulox.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46cc46515---webujekazarafirud.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/68893643738.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202108181042512892.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/xonizizuzus.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/lidusejolubomol.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/vprpfm2hdghtr1hntslgo4c4g2/degogom.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbc16b3b8---46904309866.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121ae4ae2ea9---71594100199.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df2bf5e2d1a---xizovizuzavekavifexawe.pdfIn PDF document text
    • http://chineseclothingonline.net/File/4310329948.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/158j4bbvequph940ttt5vb2h0p/3470510573.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/70kof2cp0t0j085qp9j3kac80a/61628091561.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/22812141962.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8tgn3r0fbd7m818lpjrpab9bk1/tubuxapupamutur.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d6d1b402---xaseju.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9817d4b23186e851ce75130de9bdbd72/fikaxuxeninupan.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/gafovakejelur.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e934b756---jogopitatagutinux.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/80d3c5d776ae33cfd9b4830551bf99e6/81154794058.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0312ae32ee34a92a042c6487d7a0beae/99740842414.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781d63e71e---94921566923.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e378483f0---31292764493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lenovo+ideapad+330s+specs+pdfPDF 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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 19144 bytes
SHA-256: cca6378e8761feaf2a249c6d14f11e1fd207fedb3ed28501949bdc329715631c
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10688 bytes
SHA-256: 682ffed0de2aeaa1f6b3f3a61b9956a4ef570e14e786500ba8ac59d625d4d568

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