Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e3b5780bcfb59c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 05:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0980e03433eb0dcfcea6fe4f1d4226b SHA-1: a728be721a2af0465402585b457006e3681fd6b4 SHA-256: 91e3b5780bcfb59c515c6171ef27137d3ab69c87f718cbab0471ec94c96bd32a
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The presence of urgency lures suggests a phishing or social engineering attempt to trick users into clicking these links. The file's structure and the nature of the linked content indicate a likely attempt to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/27286744183.pdf In PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102bb2b41b72---61061714540.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7892f6e8ed80e308c19bd3e9169377af/fenebozomogaxajewuge.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/18798110913.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/9858840928.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/palixuvutopidokotiguwonaj.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/77232972075.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/31210201217.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5380ccaf2---69117299048.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/58740564301.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/birizuwamuzigana.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/20308165713.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/99ed94d93ac0c591e0b9bb062e240459/rurawipeponudez.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2c140e84b81a4010f699cb719201384/51960521295.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de9ce09437c---sapowoserawezavemadejopi.pdfIn PDF document text
    • http://drironcat.com/images/file/vetaxeruluvanowataruba.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/79140698548.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/40742704279.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e022753e17---boratupibofiveg.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/farekujuzamelutibofuzoni.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021083000104314.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/savabumimop.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vuratoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=retail+management+questions+and+answersPDF 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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 10968 bytes
SHA-256: 116f2611177567adfc910f636361719378cfa9855c7a217b1870367cf866c616
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_02_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.