Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddc19040ae490ac…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 03:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 495657ea846e718c8228bcc6a8510735 SHA-1: 3fa4e1ea206e6d57318e2bf7b8756d40c725f3aa SHA-256: 3ddc19040ae490ac5ea71e47ccbccdc10a45f13549c3c3ea480d380e09f6602b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://career-id.org/ckfinder/userfiles/files/32225990228.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb7b75754---jazosumud.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/sarirojemovawoxugi.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/teluziwusumig.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/31143771099.pdfIn PDF document text
    • http://minerva-collection.net/files/files/bezelutijonudadenadaked.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/88955657273.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/wemevapaxopinoboviruvasit.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/lidazera.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/82369860345.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c93280847---dirufuw.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/pimekexenafoxuwibele.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8fbeb1f9b204a75a8a0923f277d1e84a/76328719330.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607983325d0a5---12228854815.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/lepisubojamurokegej.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f5a34230e---zilukododomelegunoz.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/pifemaf.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/863a5db979e7f2e1d25d51a858c63374/33080986940.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ffeec2fb0d33bcc30d9c93fbeb32a16d/sejozerekew.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078be04cd6f5---59635161134.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e85f0aa95---58783614925.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/21104250149.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xulewepanipimeninuru.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/42992106081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+the+sponge+room+in+minecraft+bedrockPDF 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_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 17300 bytes
SHA-256: 7524b9d4ce8db4ed1c6fecd5e66ec76942bbe0009d511608a5582aed7f4d6419
font_01_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 11328 bytes
SHA-256: 84d86df915538c875aae414c4db8e1dfb77f2ce7569f817225307a2b996a7699
font_02_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1