Malicious PDF — malware analysis report

Static analysis result for SHA-256 d028cde7670b8fe8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 17:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ef2bd2f54208399b77a4f9f5f079110 SHA-1: e14e5d7e28325006e33af72ba8879660d26a3930 SHA-256: d028cde7670b8fe8b021163fc3bcb9c9e60798868c85d261a66f3c4466a442e7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of external URIs and a high number of distinct hosts further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=silence+of+the+lambs+full+length+movie PDF link annotation
    • http://oletrans.sk/editor_uploads/files/motunibofesituw.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/44046709697.pdfIn PDF document text
    • https://airxps.com/userfiles/files/savejoxususalo.pdfIn PDF document text
    • http://domuran.pl/files/file/86730502877.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53709300051.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/77707842215.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/33240098252.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri6pvh077af5s16l680np05nj1/57894631268.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903030133.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///fakobaxezeloviguteledopew.pdfIn PDF document text
    • https://alkoplast.rs/files/82164859561.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/januxekemiwunagaxab.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210914120509134186k4fu3.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/36389047447.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a0ab6a8a---jodorigovi.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/mugapej.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210909165616.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/patibisokamidi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3513d15d50f85755ed1e731a59bd2f37/vatojokosu.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/barenopiroxoxulogi.pdfIn PDF document text
    • https://serka.com/serka/upload/files/puripuxezefajeverufeduwe.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/27887252355.pdfIn PDF document text
    • http://mq-water.net/upload/20442066041.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/bezizimewisuge.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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 11064 bytes
SHA-256: 4eef1f1b3c60a6407f182d67ed407b72e09e9d9902f8a44082baca74dfdbcc0d
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 19756 bytes
SHA-256: b0cd0fd8ea62c663227bd6e6170694fb19d1a11ad250eb679c5ca1b2b1c4e14d

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