Malicious PDF — malware analysis report

Static analysis result for SHA-256 359c4675850b15b8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 00:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ef3e194342bb780c3d0e262714db30f SHA-1: 0b6d34c873abc935b0027cdb05f390322ab5329a SHA-256: 359c4675850b15b87f33ce95b9ebda0c9e281746888fe123da61312fe39762c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b2c24094907ab9ebfd330f8ef9df26ef/fagubuwikugiwixavazaliwab.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/lavusufaziraxewakavupeni.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/89363146576.pdfIn PDF document text
    • http://harlit.com/upfiles/file/galojikilivom.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fozijajirunovimajidexu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2b004627---35483425333.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/lisinoratiwegumezo.pdfIn PDF document text
    • https://irantruck.ir/data/file/23677402237.pdfIn PDF document text
    • http://hncastlecable.com/d/files/rokakugugunozulevo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/osexo.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/miwoxamixoxelitojokagade.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/14889131047.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/lekip.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab05c419fa---86037818227.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/19637145269.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/97721832306.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dd8341075a4e6f45261e9d2a574e2581/toxasozalureza.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e20b575d---govisekimilugoxof.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/56485327047.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095a7e38dc67---49120412829.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/49244586953.pdfIn PDF document text
    • https://majubesar.info/contents//files/govudovizinila.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kesusujup.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/18755454612.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/78792040549.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/49ef89bdb0733bc74fc9ff54f5611b00/12342853610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=recent+trends+in+home+textiles+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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 17736 bytes
SHA-256: fa963e6922dc59bd80e493b497d32caa5d4c7071dcddeb77399139ec71afa8fa
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 10872 bytes
SHA-256: 71e1083a06bdd7bfe98b31d22703174aa2c5029b642bbdd95ffc7275ca13e81e

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