Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86c8afe8d38ac16…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 18:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e83eec9a5291440fed5142b237dbef39 SHA-1: 1ec08ef4b3010a1f2737059f29437d8b09df7034 SHA-256: a86c8afe8d38ac163698a6e197fd2b7e3c9cb608f6161de1316d9eabb77010be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, such as http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f8b5d33a---94142391398.pdf, are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://svb-volleyball.de/userfiles/file/wigaruzerutabofotibik.pdf In PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1f44cdfe---rokalufukufovesibop.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/66461761781.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/99336030739.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/madilarowuvelifunisar.pdfIn PDF document text
    • https://fong-cai.com/upload/files/kuzodezipowugosawamat.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/26780622972.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/bureri.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467eb32a3a---zipusixujamidi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/10400925832.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/wutijobudogabo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19c86df7f---65827950760.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/20e04dd70542ea3118e9fa527ca2e31d/vojaromikefajofagul.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/67528005028.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/zizajakegefesikozu.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/85910923879.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f8b5d33a---94142391398.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3a790eab---sinenipigisugiduxikuzevu.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2789715267.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/86200016533.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/29761455519.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210902150529704707k5t8c.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/liwevej.pdfIn PDF document text
    • http://htwy.com/upload/file/rakifixanego.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/kuxanutexabuxinaronojemaz.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/xogabakevizusixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+restart+redmi+note+9+pro+maxPDF 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 18812 bytes
SHA-256: 26e5456f551056a1743e78412c7cc3ff5f1f6286cbc41850b9df98a077c9faaa
font_01_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 10852 bytes
SHA-256: 8b7682cd38e190462cdcde1ad9d0814b732e1a16fc3bcd572fbb9237c84fdd26

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