Malicious PDF — malware analysis report

Static analysis result for SHA-256 027f250c4cb9903b…

MALICIOUS

PDF

96.7 KB Created: 2021-08-01 00:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c1d6acb633af6bc8580e6b741839d8e SHA-1: abb5f67905df823637d2741d674ac062b98667e8 SHA-256: 027f250c4cb9903b8cabda1e123db849e29633ac33610604eabdfe721c5c16c0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations or potentially disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • 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://bhopalliteraturefestival.com/mpsdp/uploads/files/votajosixufam.pdf In PDF document text
    • https://jamuiboe.com/webroot/upload_media/digini.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0d103f8f---tikasiwuviwurenotad.pdfPDF link annotation
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/zadubilafa.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/ratejonisut.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/puxopujupadaxegimisa.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5494790403658eea1cb1dc1e87f8f208/57815101733.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8604fc9a36c6d1a0e969f82a45d8735/guxupeba.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/wepatul.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/nosisefegavejugiwekitevem.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb18bb504be---taribulaxabezotafobuno.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/31914864947.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/8031522146.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a85365a840eafe593dce3b53fefd546f/vutotawigatajuxu.pdfIn PDF document text
    • https://zzwgjx.com/d/files/18932750494.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716bb9cbafb---kozozuvimivo.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67162409765.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/naweted.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160870e50431c1---91741573622.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162350314647086507528.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/5528668458.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/30307472776.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j9759c3jlv4qnp9ggbsu2r2dr3/vawekokajomezogadaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=flow+cytometry+blood+test+resultsPDF 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_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 10592 bytes
SHA-256: edec63b9370ba16711eb08c8c88ee43470bc6cea8f65ab3cb7fc29a6b7bdb47c
font_01_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 18072 bytes
SHA-256: b256c0ed8cde5187277ae5eeca96ca605b1ba53a17bf3ac791690cf584917d45
font_02_sfnt_off00015c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1