Malicious PDF — malware analysis report

Static analysis result for SHA-256 3208c64dcbc7a5cc…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 22:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0de45c3a78f15db6ad1790e444012c3 SHA-1: f20a00be2f6d7cc5469e3e85661af467e2a03469 SHA-256: 3208c64dcbc7a5cc492240b6e3acab81771e2c4e609012d7713b284740a0056f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, including compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=romance+full+of+life+full+movie+eng+sub PDF link annotation
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0904/db59392e68d36e730192fa196fb7e0c7.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/pujadot.pdfIn PDF document text
    • http://garderoba.sk/images/_file/dopit.pdfIn PDF document text
    • http://bibonatura.com/ckfinder/userfiles/files/zugolo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/12567145735.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/buzax.pdfIn PDF document text
    • https://sainaudit.mn/File/manojikusesiwovifi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/ruwakeji.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/47848019782.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133eef6c5a1e---58433883662.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/20919310286.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/75345466300.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0aebc11f44b243831a0605f57bb874af/wamufiwazirizodi.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/51256515977.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5e4a2e95621b4d6c7b89377f195470da/25624351583.pdfIn PDF document text
    • http://rideco.hu/upload/file/40130771746.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/63292228393.pdfIn PDF document text
    • https://eclearusa.com/images/file/kojotekogudojowup.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/mimunusotalifa.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sasojukamibup.pdfIn PDF document text
    • http://wych123.com/upload/files/25384279314.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/21335225331.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/xufit.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_off0000bb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4F 18968 bytes
SHA-256: f8acefdc2ade19d8df85ec4cd930e38b221d2559bbeacaad2063cf128c0a5a71
font_01_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10832 bytes
SHA-256: c6680b784a5836ce9f9fd518266efc9571a27edd97eb9086b3790a189b69c45b
font_02_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1