Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5961ed746100d6…

MALICIOUS

PDF

167.4 KB Created: 2021-07-04 11:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8e9c3eec451e191a33cbbef7bfe4e934 SHA-1: 9dbf8bc88a9f625ebc9a7da0c6a09b72b0185a16 SHA-256: 7b5961ed746100d6d41f96b71a7d0baa2d96d7ece027ee66ded9470ec1be4a93
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://cosmickino.ru/sadm_files/rowifivokagubisefuzupim.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1khqr8ehir2m3ebccm2ot846uf/59522338802.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6d124243786aed7e4e541ac6f162acc/jofovonozoden.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/25d62a9b7406fa3b7622a8f989efaef5/sijitibufadaluzekexibuga.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c04176f2187---96137580975.pdfIn PDF document text
    • http://faradbox.pl/files/file/sosamotepirexefasaro.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6693c8f3cf---nuwuvut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abff97636c---bosoxexefufa.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/63688343767.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be09b567b05---18995100011.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c939b0ad4---99138686475.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rbn89qjnp83bdkm1gnlnl3cea4/tunorexijatuxomujakal.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888759bdbe0---fegifuxisexadiw.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3603dd709948760cebaf047a452aaeb5/xukega.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a615728cb069b5045ec1a98d75d3a275/tonaderiri.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a322cf74073127ff1a54aceaca1e2ee5/bovoziz.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/99942294199.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf4fb6e9f1---poxuzobijoximaniwawul.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/falape.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gurazogezajijebaravi.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/3480368308.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/98379474079.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a53415fd02563dc290ef234010c650fa/27473684410.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/2ac3356ac25fbf813c62976f77493982/sijurijigatu.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/91631626780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=growing+growing+growing+investigation+3.3+answersPDF 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_off00022d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D60 18968 bytes
SHA-256: a1be3d4cd723ffd7815b086cf95a62b7681cee82e4c3c79e2f05e12e4c757c23
font_01_sfnt_off00025ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000276e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x276E3 10668 bytes
SHA-256: 21f305ccad07a6f3d7859d64b27e5630b8cbe586b3f536d86e7fca75aa041772

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