Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a050f28fe1f42e…

MALICIOUS

PDF

68.0 KB Created: 2021-10-04 23:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 013942df2de30c29208cd554f8c9a5ee SHA-1: 27a1446baf90a82de31796748b2253e3b1e90eb5 SHA-256: 70a050f28fe1f42e5ebc7dba7664825f7f95bf03af22b24413a3f7ff0c3c599e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of JavaScript and compromised links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161340e549460b---56807445708.pdf In PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/datujorovebakik.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/sewewoxetigotuxirunasikun.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/mufagadawitexogize.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161581826147a1---4305077051.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/dezuzapowelapepupaferi.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/jupamaroduzilinikojim.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/pananonixuruwabufuxadox.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/27703695667.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/57526116774.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/56582353193.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/pepusagoforudefumeb.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/71748911421.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/56125903007.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/49588020237.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614122b4e2a59---10551114036.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091705541513.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae9b1c8ea6---fafaxapowaniruvafozo.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kubab.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/31140147872.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/govomoweruginifuloludi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=check+if+regex+is+validPDF 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_off0000ad13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 10724 bytes
SHA-256: 56ac0fe882ef0611c937dd1c2492ffb455ebfa3a502ed248b7c29013e1f51650
font_02_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 14840 bytes
SHA-256: 2b0c0a9faf2544505791b9e688a3be06e4dedc318e215243cc7761e947caa95d

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