Malicious PDF — malware analysis report

Static analysis result for SHA-256 55efa4a0e212350a…

MALICIOUS

PDF

93.4 KB Created: 2021-09-03 19:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 589b3942cba635beaf7b1d14aa3f4b4e SHA-1: 986a39ebe33bd38429b0913dd0eaa15fea0a8c20 SHA-256: 55efa4a0e212350aa3d05a1a0a9734aac096d554a8d0480f1b97ef1c0a9e41e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to direct users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://incoyun.com/calisma2/files/uploads/maporadupemez.pdf In PDF document text
    • https://promise-land.com/upload/file/53633293060.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e66f347bc5---binisukilijuzij.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2f9cc4ec---guwezasa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f217e6d18f---rixobovivakar.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085060439fc8---41747166546.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/45411183750.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/goxanuguf.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/pokaxigesujedados.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/siselumupatar.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mfq6u3eha25i7r94i7qfn3354h/vabemira.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/t095c1rcf01fksbt1qa40jnvit/nitupolevavajepobivufog.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/46520352624.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/12424142257.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0e751816666eedac856cd73319273dbd/82567002594.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/50193406500.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1jp6tb3qp0fqkj586rm854hub7/53453996147.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/475ffa2a49e4dfd3f2e9a85cf2638044/97248477965.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/gukesaxapevoli.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f7074169---62682449381.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/farikumoberope.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd7ee5eb6d---radutelazawoxidesepudoba.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/debaregeligotiwobepatuj.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/92025335272.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa62b2f427---22739466989.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a83dbe9a5---20018964326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=heredity+and+evolution+class+10th+pdfPDF 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_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 18096 bytes
SHA-256: fa2bd1d3ee016f4fb08fd257d262e8e140ce1066397604e597ff79b2d1ae9a0e
font_01_sfnt_off000135a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A2 11164 bytes
SHA-256: 102461a97922f443ae245b0e618e936c6855762e01435fbd08f7727a754da12a
font_02_sfnt_off00014fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1