Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c4d811d5db3e94…

MALICIOUS

PDF

102.3 KB Created: 2021-08-16 08:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd14b8a9677c6d9a3c407a51eac03334 SHA-1: ab654f9104794aa75b975e001242a9288165c8de SHA-256: 15c4d811d5db3e94bd0c4c04720199363f79834a4ed6ba2620d115a7506b3e3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous links to potentially malicious sites is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://irlanc.ru/uplcv?utm_term=harry+potter+y+la+piedra+filosofal+pelicula+completa+en+ingles+youtube PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043dc52e0b4---ropabibopufunafufipara.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6e7c3d9795105280043b7e8890cd6e0a/xitemarebeposokoxinatatej.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/banazojagiro.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/bbf66682baf4490169d3be3904c059c4/pudesuguxira.pdfIn PDF document text
    • https://atiksigorta.com/files/kukasama.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/5225dbb9e54d19471d12c2dfb42b9ff1/47133803755.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/nozaragajazetadova.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/dafepodireb.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b1de830e---sikumul.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/16430902072.pdfIn PDF document text
    • http://euro520.net/userfiles/file/162702454989704075.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/bosunetifujekikedas.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/84455503200.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160838b2d1f220---11104190582.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d52c2dc2---12194132744.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/28533231615.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ba33a1732faf2086cda39ecc46adfd33/dawemawezuzid.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/dusipasovoj.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/86529729641.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dc23a39f---dabisudokevuvul.pdfIn PDF document text
    • http://biosite.ru/images/news/file/11250479970.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e18f1037572214f81fe72e2a13aacd7c/vuxabeku.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2198a5b98f---lunudewodovupapukotus.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/76918804452.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160840b84b2dc6---14046062786.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00016962.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16962 18372 bytes
SHA-256: 0e486520e1d23aeaf188322901c4878b36f048f6cd2d45909eb7b524fd7ac417
font_00_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 11308 bytes
SHA-256: 0b2f1443c0956916a531f64d63b715c3a4d7efbf7a49d55ff87e24031abb833e
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 3264 bytes
SHA-256: 0bb4d6d157896cbea8180c85bdaf6d5c688bc5062c85fcacab08d1149f7800e6
font_03_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 19388 bytes
SHA-256: 1beb18f608d1b960aa94e01c3841cd6387e7f795a21b7b7a2995705736cc1c24

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