Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa0311a5435fa39…

MALICIOUS

PDF

100.9 KB Created: 2021-07-02 03:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e1a6485cc2626694bdfd560608f30201 SHA-1: 988fa363f4bb71abb29729a7041b8191f80de35c SHA-256: 4aa0311a5435fa3957684d1e5a4d07b835037b05a4d98dd2a733660e5c780d23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://smidgel.ru/uplcv?utm_term=hardship+meaning+in+tamil PDF link annotation
    • http://infrabud.eu/fckpliki/file/66915621755.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d92ebea56---rowirekad.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e149af1a---xamukulerapenuvoj.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad71d5399---kuvarexonefusuvevufopeje.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///68251349831.pdfIn PDF document text
    • http://wjcopy.com/upload/files/8994147062.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5aa53751d70bdb993dc30224ced7f6db/bigilugi.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/35467494873.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/guxuxifivubalaraj.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/1268930321.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f6e5eb39919103eaa922d1bc7e008e26/xobegizobuxejorox.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/rovoxibubupirixelele.pdfIn PDF document text
    • https://nadamasristorante.it/file/81631436467.pdfIn PDF document text
    • http://biomisszio.hu/tmp/59783157230.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531175404.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/lasowixiwaxevefetu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fhhlprthd05b2cc2n8fv1n99m0/zogumebaxodosokates.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1a8880d8.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/98890407955.pdfIn PDF document text
    • http://dzbnf.com/upload/file///75553543662.pdfIn PDF document text
    • http://jucal.es/images/file/juvozazekomamaroraletax.pdfIn PDF document text
    • http://wych123.com/upload/files/jubexowolivuroludovoli.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e2bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE2BB 19272 bytes
SHA-256: 7a8551b7ceb0234cc7c8ea5fbf06ab3788e797ee5452a0b6bf9a0131990885e4
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 4484 bytes
SHA-256: 1f89670881843fd421e379f48967baf92c4d3b1af9dfa47447591b4199f330f6
font_02_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 26780 bytes
SHA-256: d2510279fd225ae8654fff7ed517ccbfa7f6a5a45b631a8c2b671fe6203452fe
font_04_sfnt_off00016d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5F 10712 bytes
SHA-256: 8e8836bcd9086d19bf5690234a5402199cf2586e00f54985e0bf8734d7da08b8

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