Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c3f53cd980b236…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 16:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c387593e2df0a1330493adb7787d1971 SHA-1: c2b4ea7e67a1602734e6562cb1841c254ada0ed6 SHA-256: 63c3f53cd980b236469089ea8e5888a7681a293fcbb86a0830f4ee5b055eb6a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=imaginative+writing+janet+burroway+pdf PDF link annotation
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/6je5tkmj39pfvfvnt2tlkream5/22789269225.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/gakedumemunenedaruxogijo.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/68902232703.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/wujaxuwirapibubiro.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/22462009915.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769a26836da---10082408518.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/23607641662.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/lerolitof.pdfIn PDF document text
    • http://mobiliteit.nu/files/vewajonoberutufelu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fbr51rs1gm3dkklrekn4jrtq4/valolitowopabinot.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/96783870436.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082a1633f1f4---58789058204.pdfIn PDF document text
    • https://yodobashi-church.com/30526860927.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e831924db1---zorinuwapifoxanupon.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zowobimeb.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/22974532560.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/reruvupadakutajakukojabi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/24328438394.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/67720348848.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/lasat.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/86b6633614fb7232055ec3ebfedf163a/solamik.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4300f3aa04f9038b6f3f8a0db854df1a/tirosotodiwusetojotefo.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebd53c96c---92008042001.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/31582315332.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6182372f2e---66193396480.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/38057566399.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_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 11212 bytes
SHA-256: ea5e9aaf0f610e9a87ddda975373ef68b18b74281c50032200499eed75d89d15
font_01_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 18432 bytes
SHA-256: f0acdd5558552a621db32fff8df1c977771756e8dbdc51952184ff750eb01c19
font_02_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1