Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36feb323e96acd4…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 23:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 162fce7317e9778ab80b854b7379fea9 SHA-1: 737f1a2c1e2b5f410f4b9001163068cd5476a56d SHA-256: a36feb323e96acd4136f029735ae1ff925b9714ba999a185d3cc2238e063f40e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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 https://bya-ingenieria.com/ckfinder/userfiles/files/82218153137.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63e924dba---8543083125.pdf
    • https://avigailpekelman.com/sites/default/files/file/sunuburusejalodak.pdf
    • http://jikaramen.com/uploads/files/rurebok.pdf
    • http://hydrem.ru/images/file/pikinevofigopaserepagenam.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f7b011d3---nibanukifurifireg.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb266aae6e---2265215453.pdf
    • https://atkarisuli.hu/userfiles/file/9921451484.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e4577105ef3a16dff5d75ff0d8e5ae82/junupaxobozigo.pdf
    • http://www.pzkexie.com/up_files/file/davonofawekifaduxopagexug.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e9fdg5is692l3i0co9tkib1k01/29844895502.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/46180703733.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/99597366681.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bd5474d4d8d6131410ef9098276f305b/noxobiluwebaxipeguf.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afda861ecb---77446010939.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28cd17dcb911c029f307cb89d937881d/keduseneverew.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/1f0ee2b38bf50ba721ff20d53edd7706/bedig.pdf
    • https://harrisitalia.it/uploads/file/99383236055.pdf
    • http://abwmarlboropike.com/uploads/files/romulutegejabinabaxufoko.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/37398055851.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/geg4li1i33hb6ovqu0t27cjra3/7211375364.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f58f486e47e7d1f680946e15a30f61c9/zisemoruvazedobotujutibep.pdf
    • http://hiace-yoshikawa.com/js/upload/files/welirago.pdf
    • http://elturo.ru/img/upload/files/kodumawalozuxukona.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=import+excel+to+access+database
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16792 bytes
font_01_sfnt_off00010d94.bin
effe790094761dd07eee6b4352f8fab4d7c29be6d6857dec87591b28fb952a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10672 bytes
font_02_sfnt_off000125d7.bin
ad1338b1094afa96d71afbb81e0d708e42ae454b38820e781ff9e4091230a130
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 17484 bytes