Malicious PDF — malware analysis report

Static analysis result for SHA-256 401012b51ade7b76…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 05:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f03dc210b6cb8dfb8f0508fccd6386f SHA-1: 86affacd8d09ef56f92fbf41ccaab888d20512dd SHA-256: 401012b51ade7b76fa4cf157a66e79aecdc9564600432fc1398bcd6e744982aa
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/19834417410.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6pq2vojknif9b592h9dri3ife6/lojaziwagafotoka.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ffnf6v2nhpmf6ajirh5afhg74n/75240197062.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vigerebimaruxonutokiza.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/gutozax.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ih0mbcfocvkbpn76ipnlknb047/zamonijetukugojedij.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c5f48634---20243937650.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/34603253781.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/57bf35b03862a0027d7980edd6ffcdf4/35287645307.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7o471691sk3jd31hvtk7j40qpv/potamubojofudumofagixama.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2fo0kvkcv56pojf8ntcj4iekue/46267983128.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/nagezoxemadarewoxaj.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/77066633331.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/slon46c534ruriv4dcd1a6vmp0/8503257994.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef5d1d7f2---poketudejozukikavajezek.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/23043553160.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dbd6380776f610e891f55668c2eeabc4/nofadegedusobozubukugiwo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3359b7845---80412736250.pdfIn PDF document text
    • http://effektfilm.de/files/file/93294739982.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4787994a---rutizejo.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pibovemekumu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/oij9mjl9u7gpdclol5a2mm94fh/55968556266.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4d208ae24---jutivutinitiz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8b701ee6---mekulibojipezumid.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sa1sjil28sksiomhr268rr6d7u/84272374618.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/cbkglhj4po14kqufua3kerkask/kurogajakesem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=insert+a+pdf+into+word+2007PDF 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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 16924 bytes
SHA-256: dff1c4a4042c58b1bc91862802f4301b94c8a0b59bfbef36fa1cc19e4b546012
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 10776 bytes
SHA-256: a572260d5333f3f86f180e1b4d076b8f9e23061a7bb6a2d83d10750c7cf5b228

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