Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94609b2ab116608…

MALICIOUS

PDF

104.3 KB Created: 2021-07-14 00:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b9d73ec4aa6fd4873cbbc9bb7a294ea2 SHA-1: 5e765b2f922ba817020fa12eae0192a47a16534d SHA-256: f94609b2ab11660866ea20049cda38db6dc83cd2662f39ca02d2c90a8c26b645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, so the primary attack pattern is the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

Heuristics 6

  • 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 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 https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/38ade011af1ff292427f86ac925b1b8c/judaruxamesofadudi.pdf In PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/87985939269.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/87646799422.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bb49f3d564bf241374607e58196e792/4848273829.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/pexeset.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/df2ettr81d8ql8hvdl3ci03h63/94284591459.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/982782f02bfa2d8a1ab4848b4b49d764/ralemoxilabojurebemax.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ifi04sp5rupmoojavcne8ned4r/pibisisuwefogipekowejatar.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f268f3c010---12328822688.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/93757336125.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/junusiwifug.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3j2s95rl3q7et8vi68igbc2cd7/riripusazopikis.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a34fc1612---50592783885.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2b4d238592b44e10f4c4f349beaa24e6/99461846422.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32804793519.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/98144001478.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/57117496931.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/pomadumuxusukupuli.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d173d568c1---sowofe.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/zesiraligejuter.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/1657387543.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41399b2ac---46880089170.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d548c0e4---71932266896.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/eba8793ba28d5fa8356c085527fc90fb/naziwugowaziwededizege.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9595e6c2d190420a058a0d862850408c/38137371866.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/fimiwapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=secretive+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010044.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10044 20880 bytes
SHA-256: bf0954415afb7ddac633a742495fa30bc196a1ae8e41036517256919d09fa8db
font_00_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 10700 bytes
SHA-256: c8c682b4eedfd05787734fac17f6534e5020a76a038056e450096e443e64abf4
font_03_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 29684 bytes
SHA-256: 7d32371b73ed4dd05818ad5e1ab9d1a2daa758950f4bcef4ef1115a9ded6a2b6
font_04_sfnt_off000183a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A5 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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