Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a57971b373497a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 09:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 643fa34967c826c4adaba78e3ba89165 SHA-1: 5f0adbc8d9047615c7b73b37af133926d5c528b2 SHA-256: c8a57971b373497a15cd1c908b7aa05476160909e3b0350c21aa04f19535abe5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple external links, including one pointing to a raw IP address and others hosted on compromised CMS upload directories, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm structure, likely for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139272e08a93---radow.pdf PDF link annotation
    • http://erpsamik.com/ckfinder/userfiles/files/soraxoxa.pdfIn PDF document text
    • http://machulski.com/public/file/mizogukavidure.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/vifuduneralixirubu.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/70447535080.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/masofimexa.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/83250312173.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/nuzejudowabu.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210902133342.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/jodisekubirixotejaw.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/6486059721.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/565b9031c78bf9ddabab0fabed6872dd/86665328049.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/livuxifi.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/fezeduguzolisivaguwemujef.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/bizodir.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/98477785468.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c57d3e2f---70043335254.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/sakokepujurevobume.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/rezaguvofirem.pdfIn PDF document text
    • http://calisnt.com/uploads/files/jojoledawog.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/evie5afvva3ul7d5t43e1k8uto/34925122812.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/nezefu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f222d19f299845a64bc66b5188f79461/luwogapamikigebojigeso.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1630d0a49---sunukuxodese.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/eb668357119e599ce78d576c4c5176b4/81261213966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+draw+an+astronautPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 10148 bytes
SHA-256: a892a755126fdddaac5430aa03ad5e4a0f97f6637c892a6e6f31d3fe1decbc80
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 17532 bytes
SHA-256: 4609e4695b46703fe26ab2bf86397f6146d092e4ac52590c0236dea77c6b1794
font_02_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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