Malicious PDF — malware analysis report

Static analysis result for SHA-256 f721f074b457d0c4…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 23:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f938b0b059570e4c2c09c8c1954cece6 SHA-1: fabc742d9cc401579984c4727a90aee930525416 SHA-256: f721f074b457d0c40f174a0739a97fe9d77c734ba3074b77ff29d28c9d6b906d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://adaviestransportltd.com/userfiles/file/rapipivi.pdf In PDF document text
    • http://beloezoloto.ru/userfiles/file/64067962607.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210714031633.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/25698560343.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/59058827800.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f978617e6---83147992823.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/91804929889.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/32584152999.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a245fee653b1f971d1c018202296ed7b/vesakid.pdfIn PDF document text
    • http://www.centralperdana.com/file/pepup.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/33936172725.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726b03ece2d---88115783323.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xukesap.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r4hdndfdlf47unujm5jn4osb76/midovogutadurapelijo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/vajalaw.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/bapadipaweponipefazoga.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f3c1f96789b7271c7965e0d8bf316c5d/nutibas.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/jafitijetobow.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a1085627---novigudabetuvirut.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cqpk6m6qra79bvhh9kh9pktc80/63398355583.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4qc1hp6802j2d9ostbt5lkkvlf/mutidedawa.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/fizanikuzixixoxilivit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=program+watermark+pdfPDF 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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10608 bytes
SHA-256: 66b84bb5783d3885cbb710c239570f29ff9c2df82819ff94a9a31641f4491b96
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 17080 bytes
SHA-256: 7a203ab3337879e438557e64ffeaff837900ec734894ce40289479a4a489818a

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