Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a6f6e864ce9c17…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 08:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6c86e481bc62851baab5263d80b3aa9 SHA-1: 690e3e62c40858f436e84a3fd9a13a699a72fb7c SHA-256: b4a6f6e864ce9c17a1cf993d5041fcb4f9e138e098c2b63bbbc1b4a55e0fa0d0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketdoanbus.com/webroot/img/files/11470439907.pdf In PDF document text
    • http://cropscipublisher.com/files/upfiles/file/81295347851.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/24670988117.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc1359238---wedilonezefibaxuzewi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/1649552979.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087da2e4dd6f---lafopetokubuk.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sefefoxo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611690cf3170d---67052598555.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/lugorusudobavogawabep.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4f0d302ccdbb0567b68ae413614396c5/fibilomudesotukir.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/11069268292.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/bowosi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d6e732282775646a6fe9be7d1e121cc6/pakuki.pdfIn PDF document text
    • http://simoncaulkin.com/images/36354028714.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/59000853b8f518778f85c3e2dce9927e/vevakajemutatajizufuj.pdfIn PDF document text
    • https://gilbertems.com/videos/file/gofekan.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a6a6245093846eb66fd17c243b343db7/fesusosugoporogited.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/nevizasivanilo.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/kujowax.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/99949886499.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/29f8e4208353713c14316c8bd906155a/wamimirinogogikore.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/35265240102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cover+letter+for+shoe+storePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/buxutafozub.pdfIn PDF document text
    • 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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10052 bytes
SHA-256: c34822ea2fa7b9c155b5213460ea0dbc0fe716c53a68e3308873ef3e01570558
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 17984 bytes
SHA-256: 3965dd59cb39244d1878e6b8c0447c99db46cb931667a2833817627cda4e7900
font_02_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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