Malicious PDF — malware analysis report

Static analysis result for SHA-256 c307eb429145b30f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 01:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3838eb2de649b39891abdc99908d2d34 SHA-1: 73fa57e708327920aaf924ef19bc7c22e6f29f95 SHA-256: c307eb429145b30f87f68e3507393a575b597b85b5288b9fb7d47c38eef0ebbe
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically generated URLs and compromised CMS uploads. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and external links suggest it is designed to trick users into downloading further malicious content, likely a phishing document or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://archism.ru/uplcv?utm_term=dms+handbook+5e+pdf PDF link annotation
    • http://terezszilvia.com/images/uploaded/file/gimumesuxixesimagos.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/matotofopav.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/69471795197.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/zotorunuravivabe.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15330574224.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/fokozeduvape.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/30141279805.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/84898485402.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/77835330147.pdfIn PDF document text
    • https://suruburi.net/mm/file/jikuzixatenuwaxes.pdfIn PDF document text
    • https://majubesar.com/contents/files/magitotuve.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/pusukemodakejigujoso.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/96366307754.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fulavokizijonomenekufufu.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/12331173558.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bozexodosinosarote.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86e4172ab---38377908825.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd8aaf89---60217494223.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/75033543221.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0c2baabf---redut.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/dutetudatewonulegojoduxos.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/54149367713.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/87400794101.pdfIn PDF document text
    • 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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 17008 bytes
SHA-256: 69da89c7a53bf1d485f06ffcc4eb2e5316b40ada82616aa54637f9baf4d93c75
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10796 bytes
SHA-256: 68238eb63605eb999e23b958d0bed5557c972883215993e97438fba9eac325cd
font_02_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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