Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30f69802515e260…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 20:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6baa1d52c81f99957e970d1d8ad838a SHA-1: 1f1ab3b224ac5f330797a9b50478d4e561d751f4 SHA-256: a30f69802515e26081879c5b05d2f1c9e3e1b80ccf65e37b1f4dab6474bd5b2f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, characteristic of link farms used for phishing or distributing further malware. The PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://cructi.ru/uplcv?utm_term=kruti+dev+016+font+download+for+android+mobile PDF link annotation
    • http://salkim.com/userfiles/file/sisozifenutiko.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/lititepufovozawozewofiji.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/dagevefulosiduxifetap.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/gfoVRHcFsB10.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/39646600433.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/68049300637.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/26529773136.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/nedisurodofalogarewu.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/pokisato.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb86a23bb1---94837405773.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85aabb6d3---67489089598.pdfIn PDF document text
    • http://clickvay.com/upload/files/59003183424.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/52488639222.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/golowijusovino.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/11097218955.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/52537065542.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb93a6389---toxawo.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091710163672.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/zorexazubeperarofi.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/misabivawax.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/122db2bcfc1d1f999e49aae6c5fbfd75/fifelibibirir.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/welakumaj.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2b78324573fbab5859e78d854b64d073/tuzitasipotowegumu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB634 17692 bytes
SHA-256: 81bd3a76842140ecc05c7fdc1fb2f30edeb721ce5fc5b902396e1711fef2e58e
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 17620 bytes
SHA-256: 2a7cd8fcb9914021fbae5640e33ec8a1961fcd6d027886d5657ad102fe8f909b
font_02_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 11072 bytes
SHA-256: b20cf085fdfea03c80dc817cf36d51452c98f3c7a8767247a230f2f5e498fd39

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