Malicious PDF — malware analysis report

Static analysis result for SHA-256 20292da753ccb0c5…

MALICIOUS

PDF

94.0 KB Created: 2021-07-23 08:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b132958b04f8caf50cefbd927b03a279 SHA-1: 0a550dbd4c23c7e61d62617e09eb9e22810478d1 SHA-256: 20292da753ccb0c53579b3b2e1812fc2e1ce0a728c4b4a543ba94063719152de
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, and impersonates the Amazon brand to lure users. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=inference+passages+5th+grade.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wenxuezj.com/images/File/suvebukawixivavadob.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gb6oi79l91i59gmvukh1k2011/91785327022.pdfIn PDF document text
    • http://short-story.ru/upload/file/11300437584.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i1n74fvl0ar31lrv1935qahlv7/fojonumokebipuw.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/797710b22521d4c4e3a42a09263ba898/dixapakopumepalezut.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/39276408348.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tce46u3sfqtjvn6ta412se8rdf/15604589943.pdfIn PDF document text
    • https://epiphanych.com/images/file/girebapinowenuzesomefab.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7ad8a31d3b1e18c1be917bed93562311/xuvogonivewujoka.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/danubotapepokapomes.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/pedulilapavesubukipisafe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2163be41c---dupitetaxaxa.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/84c1b2e132156c11edfb76c547ca100c/66275956121.pdfIn PDF document text
    • https://agatanorek.com/files/file/49792400774.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062020064073499.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/famugaxulefuwojigoburave.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/3337576699.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/26517952809.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/dewexuwit.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/mimonewenenerakezox.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/dozajalisirutifikaz.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/43784045901.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/vga8ggcis2t9jm4e3eu7h70bfm/99592691734.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052620044621.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0cbfb09aa---nivotogafibe.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/evc26lk8pjfu91qecvdnkoh89k/bemaxitewogijot.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/sf8eq9qjok93qdphvrq4cboc7o/jupomerijuxine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=inference+passages+5th+gradePDF 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_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 10728 bytes
SHA-256: 0df45436e8c1b988b05647e5ad0d5f87946dbbc4dfe13230691b0b3750eabb44
font_02_sfnt_off00013e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E35 16904 bytes
SHA-256: 412b489e78f295435d56559f0c95b17ec982cfaccc6cc884f0a7eada2532c14b