Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8a2c5943e25946…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 01:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e420b5456f920e4c22e31886d59d764b SHA-1: 54c0fc6bcceba6593a1bf0a48630f88ca373a4ec SHA-256: 7e8a2c5943e259469e678d6bbffe31eac51b12eac865ab53575a2e1dc63e62ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yenhuy.vn/upload/files/46257896435.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f73d04a1---jigezebasozulutisal.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0395869533369d492b868801cc1fe278/42065144580.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/tovof.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/varuvamixul.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613933d637bd1---towodumeke.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/givaxosujesapufut.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/46263147390.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/piwurajaduvos.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/zekirojasebuzu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/tewalavusafawidozaj.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/sumux.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4541293c---90255429982.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/jofipadijamebagesupufor.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/93900923108.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/vutepomajoraj.pdfIn PDF document text
    • https://davnosti.ru/upload/patojubobavodaba.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dekoxaxetekemufixaxakid.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/nuvorajolatolisajufeg.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/xumataze.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/80319778549.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/92677726089.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/libudowatavuwikewi.pdfIn PDF document text
    • http://test-immo.com/file/45806960667.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/nixowemiburomexofula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vmos+pro+premium+apkPDF 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_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 10324 bytes
SHA-256: 426cb87bb632c4189a51945a35ddb2cc31bf4b181a645e8ce2d9f5269eee6fff
font_02_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 18344 bytes
SHA-256: b48180cfbd30f67b99ae40b9f98883cfaeb1292facd7e6da9cb1952bc3dbe822

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