Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c01ac23ecf97e7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 06:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c7f6167ba2db00d561b925e4e41c10d SHA-1: 72ec154b5f93245d62834c7faefdb8814caefc41 SHA-256: d7c01ac23ecf97e7a8cb1c6c4af4670d5d7ec419d663b69d3f54ea33bfbf41e0
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://brlairport.com/images/file/leguvedinarezefozaf.pdf In PDF document text
    • http://alarm.pl/userfiles/file/67142380820.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502d499eaf---28220855118.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/12168006857.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/gefupolapov.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/liroduw.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/wazuzipimulatexogorugebor.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109061707496105.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139003993850---40124311518.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/sedirepawixozufesifemev.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/94e494b4e041f9bbab08257ca68041e4/turexuno.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c68d4fc---raxepulobibozidavop.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sununijofuvozisukipapo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f93cb290a---maxifiwelolad.pdfIn PDF document text
    • http://specialcats.nl/media/files/tefatuzu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/fuxuvesiseko.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jebatozenozafenax.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/vitasiterilalofute.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/kebute.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/1138679459.pdfIn PDF document text
    • http://nscenter.cn/upload/files/45411044900.pdfIn PDF document text
    • http://chikatere.com/Upload/files/70384880904.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/97263262750.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/tomugulerok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+find+password+for+wifi+on+androidPDF 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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10392 bytes
SHA-256: 595c791770deb4ada16cc273d19cab3027a8280050ac4b957bc15547e347ed07
font_02_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 18280 bytes
SHA-256: 4029ce53a8a4957e5ec02a69bcc878bf15d4a0dd0185a4cfb20ec20619d4953b

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