Malicious PDF — malware analysis report

Static analysis result for SHA-256 d103f5e868a28d57…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 07:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb9a1b0937e345eebada092d3e90992d SHA-1: c70620505c0fe930f97d648f79ae7f9964a08007 SHA-256: d103f5e868a28d5745f9ce622cc77938b37ec36473b3919fa2777626e32e79c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier as malicious and also detected by ClamAV as a phishing trojan. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of QR code and callback lures further indicates a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://brawlcall.jordanadams.com/ckfinder/userfiles/files/roxurefojefozixenavigepoj.pdf In PDF document text
    • http://miyozenemeryville.com/uploads/files/46546362304.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/pajuvozadumawibafutid.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/25817703423.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210912133645952.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9bde3244---basikazajafajaze.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/basuzegagefifufunofu.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/84827263884.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/92396428368.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/zixekumebufepagarimuzi.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/25970110116.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/8680961369.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/39001408062.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/nijidetel.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/26916200979.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/virekesori.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/24548550558.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/46883419826.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/86173186420.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zugexadiwuwajunexiliwe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acad527717.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gulid.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c72ed20f38---24111930092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bey+qr+codesPDF 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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 10172 bytes
SHA-256: d7e5651e506a90d9c577798595d24021520444bf87204c74ae6c6c45d5bf59d9
font_01_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 17892 bytes
SHA-256: b4af201fedd254a92965bc5ecccdc771ff10a16b5125b0ffc064e5d08f62c2f9
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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