Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8876f690dc15a86…

MALICIOUS

PDF

96.0 KB Created: 2021-08-07 00:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e798b08953faabea97dd3a3a119a78e SHA-1: 70321be93b3b79711c2263c6383eeca5a3215972 SHA-256: b8876f690dc15a8665edc983f6a1e30edc96a2d5dbd345084b9ffadd4a3ff736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these indicate attempts to leverage compromised infrastructure for malicious purposes. No scripts were extracted, but the overall structure and URL findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=grandezas+f%C3%ADsicas+e+suas+unidades+pdf PDF link annotation
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/iqdmnu5s3s4rs36o885vhh72t2/javolaneliwutojufozowixiw.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/wolosobalixesenoxesapire.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210625212023060.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rarowusigewewupolunodaki.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zozefegelolenerotelor.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1dbcd2256---81866743653.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/livomosofaxaberoresitamuv.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/37910887543.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t227e2qtvdhsbovqdot4s8i4n6/wikiximizumotavu.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zubesazezaroles.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/54db347f5c97735a4ef504fc6e7d4841/88704310277.pdfIn PDF document text
    • https://akconta.com/uploads/files/927548136.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca51f288c8---fubanofefedusikatijawa.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/29062246147.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/93800993530.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/72e8149359806198df137eb34033a9df/mokedol.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94cac8c829---widamupadibi.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/mofujojosuwijevefuzur.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/39187011670.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f7b89b1d0ba6610ecffd8ce49da53150/53712129761.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9078daaadf---vumozefenesuderisokof.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7c6a96690d2a7f1ec2d09f832ed7eded/11765278323.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/00k1bff724mhsqpdhnvksd4tvo/63239503293.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zexifuwadok.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/afierovlapu7i08htcdfmumbsd/50809381692.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_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 20704 bytes
SHA-256: feff39772660ee1d110f327a077a6f1afe5db4d6e6313c7621fb4f343725ee81
font_01_sfnt_off00013fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC0 10612 bytes
SHA-256: 0414bc5f820506c1abbc8dc94af3c01e2a97e7eca56efdd4d08982f14787e773
font_02_sfnt_off00015820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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