Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb70b659b8621bf…

MALICIOUS

PDF

82.0 KB Created: 2021-08-20 21:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5aa283db146fd961ea23594cc1576f6 SHA-1: fb69618f6b061b6ebcd0847d922dfe9866f70658 SHA-256: 2fb70b659b8621bfc2103c4f2bfdc23c9d05492e92dd61227852f616084446c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=hbl+challan+form+for+ma+punjab+university PDF link annotation
    • http://ristorantebiscione.com/userfiles/files/tesisutimufotil.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/puvojiratufika.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/fumez.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fka999g71q39cpq9hnsavohlk1/bebimageduwozesis.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/22567114349.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d804715cb3---zuvemutep.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/kumasujerujora.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vapobefobaretiwuku.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/32401003701.pdfIn PDF document text
    • http://change-sexy.com/files/files/meweluta.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1af682a1---94581611859.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ebt5mjpp56f4usr286umarkivj/81107255978.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c104b25f11e---rugalelarufusu.pdfIn PDF document text
    • http://linker-apps.com/files/88464711703.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/52816828791.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160808348e4b93---butoregufekemofi.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/degugodasajetijibozibefuf.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1c3044a525720d6bcabd7c43716921c3/berulujizaboje.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/70472594079.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/20027825827.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/sidelekuzunonememokije.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/62494933104.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c4fa0d5b---wejetuvaju.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e4ac100f---47490271163.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/65042550029.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_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 11288 bytes
SHA-256: 021be6fb430cb33d5b17f8781546af4480909a2d56130c999175aa4286bfd2fa
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 16944 bytes
SHA-256: 6a628d70d52be912de60cd5177fb3128456b3fddeaacdc90baa2a441af1fadfd
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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