Malicious PDF — malware analysis report

Static analysis result for SHA-256 272c78bcfbb9a0fe…

MALICIOUS

PDF

87.5 KB Created: 2021-08-06 20:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cfb65bd52ddae5b09c535398eb32aaa SHA-1: 802fea3550b19207ee4e983d8737e03b9e07a443 SHA-256: 272c78bcfbb9a0fe1577184920fd25323790a554f44f28261357c5b12fdb6e97
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing or malware distribution scheme disguised as a document download. The presence of embedded JavaScript indicates it may be used to exploit PDF vulnerabilities or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a245fe8b00d---talerini.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78129cd926---fudubigozamuworififi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a230c7e0---zorevisoxudugidefemefotiz.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/3938776290.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb55adc7296---webimojobosupafit.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f4d5489a---5440464913.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/58996360591.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sunemoz.pdfIn PDF document text
    • http://chinalabware.ru/d/files/nanesira.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794f053a93a---patis.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0926d90c1d---31082341466.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/58435695688.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b5f425ba---8807852358.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d6fa24a5eadd868a626cdf24d0b80ca7/kigigotigeli.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/594sbueaeu3ojv2ktgd0kfo5kj/bomed.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57619396332.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/17447910444.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/93637396013.pdfIn PDF document text
    • http://metapolar.hu/tmp/gezofadumoramuf.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/vuxok.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d2137045d05.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/20250889298.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b019c1ae7c20662556af95e4ee5f2816/jajedamafikutugez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sample+question+paper+for+class+10+cbse+2020+maths+standard+with+solutionPDF 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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 11724 bytes
SHA-256: 503087dfa721f1501a4c77ae3a77e6d351ea00d08152cb1ec9426cf1c502b08a
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 17232 bytes
SHA-256: 6cb99306757a586460529a9cdbd23caa2d94599fa39e1617c96191c37979f282
font_02_sfnt_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1