Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f2a3236c0c1089…

MALICIOUS

PDF

77.3 KB Created: 2021-08-28 00:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b9154709b8869584e870292b9fc0b93 SHA-1: 2f4e7b7b4b42a8bf318767f80e5eb3c66e74c6f7 SHA-256: 72f2a3236c0c1089805c7b587ab36b254115f56d537466e89173c61a61a2a934
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. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The primary attack pattern appears to be a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0434b97e29bde2f1b6b21665abb47be8/42467967493.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2faa9cef84---rawikuxe.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2ade5f16---90066310537.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/lajigizenuvawowarefokeza.pdfIn PDF document text
    • http://chinahongji.com/d/files/48521721826.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210616124639272.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/91cb6e0c0e664e1ea86b0a238d865c13/gufuxopinurapi.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/dirajowivejepove.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/tasobanebibitemisoserak.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/ninawulakenifituse.pdfIn PDF document text
    • http://feminella.ro/upload/fck/butuzurukitid.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727475fe30---75060550692.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f639e00707f---rutiliwiv.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0c9b85c4---patakonagulutovag.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210813192646.pdfIn PDF document text
    • https://etadelloro.it/images/file/zogefavodud.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/51feeb545cd273f3a31e606cbb8fd477/wuxixe.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2b033653d3a3097e5dfb172461d167cb/29038469364.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/7635522686.pdfIn PDF document text
    • http://fields-on-earth.com/923613857.pdfIn PDF document text
    • http://zuche0551.com/upload/file/nexofomubefuwogijo.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/72791155135.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/fawim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=grudge+use+in+sentencePDF 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_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 10356 bytes
SHA-256: 61567074e4f9f3f2760ed0cc032750e08a5d413fb9370ac189b36edc019aa62b
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 17224 bytes
SHA-256: e9c6f4ec61b1abc5f4c801d460f1f68c233771fc468b8056f06a2d04b508865c
font_02_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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