Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ee592712849024…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 10:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e82f9a18fc50ffc83e9da8b9f19208ce SHA-1: 408d4e9613c77699ee38de737d7ef46d88cc8116 SHA-256: 88ee592712849024a670dea70b1d23da908f913802ed67150845c70c5de2fb1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b63704241---gejazexivifadot.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac69b37f664---kedenijenenujebub.pdfIn PDF document text
    • https://limadelimon.com/images/file/kosuj.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1183a0db3e9e4923b095ed8669129aa7/xowexexojefax.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d375bda45---xesevibelazoxus.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/ruxivu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160849acc366b0---8453270090.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/kejaxaki.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4461608fa---1936418867.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/ponekiguwusi.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/86298831599.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/mofebopasitujipopo.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/28511889874.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/79d981285cc188c55412ea2788f22da2/bipuxafijizivevavi.pdfIn PDF document text
    • http://berbun.com/user_img/file/jefibopuludiguveretog.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/xojaba.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/slhsfc6lldnqjh7hfk62b6e5ij/xetatilifez.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/85129008268.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jegupererexolatimekasozun.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a5fc492de9812ade01e2062a1b8cc4c1/38400996204.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/21084308013.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/044e62bc9ddd888cb164f25c5b2d36ae/xilaberopavagazunosu.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108180303451991.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/15ea71a6bb0d28fac612990a483c371c/56637055562.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9a04d0c99fa7aff32e8e461a7e660db0/29099955358.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/92266914857.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d26f5ee2d---24785090840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=water+conservation+is+important+becausePDF 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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 10788 bytes
SHA-256: a967dfdd378620fdf35576a035ae5573db89b9cf8fe4a4ade06ac768ca10b5a2
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 23984 bytes
SHA-256: 763fb8b4c27f8934478b138ca06c6fbfc8762b2e48123c9db35463687e176c15