Malicious PDF — malware analysis report

Static analysis result for SHA-256 829577a167f3ea4b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 14:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 008904c3d1155a563c8df9fb26d1d842 SHA-1: 19642e87882890e6cd42c65f55f71552b6c3aa17 SHA-256: 829577a167f3ea4b9e735b463e9b67316708bffb806aa68f4f3b0eb519195193
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure itself does not contain readable content, but the heuristics point towards malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://wooshin.kr/uploaded/file/148455497960a35ab33476e.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c889da6610d---majagipituvitagu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c099a5b254d---pepifexapebonepufe.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3668982d9---ziwafosigowe.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/55172466622.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/84c2ea846896d436b829cfe653d0ebd0/tiritova.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k4vm6uott9jpso92o25mf5fquj/loxarol.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d95adf4ab8c5b9faa81fd75571ec57b1/38519521580.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/retodogapuxug.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/52431574483.pdfIn PDF document text
    • https://sealskinz.ru/files/file/xaxamomalabo.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///4112527390.pdfIn PDF document text
    • http://freeski.hu/freeski/file/40881127073.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/juxewo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4b74507ce---41649120521.pdfIn PDF document text
    • https://uangraja.com/contents//files/vagebagikepavenum.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/mupegapuzopozek.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086694509e2e---13638752928.pdfIn PDF document text
    • https://airbays.com/userfiles/file/91645256480.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/norewejotipusazoviver.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pmhgrvpk8ujn72137bj5f941c3/12996003206.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/78401567529.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/55594528631.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210829_33B72C50EB14E28E.pdfIn PDF document text
    • https://nadamasristorante.it/file/83275113723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=common+noun+and+proper+noun+worksheets+for+grade+5PDF 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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 15980 bytes
SHA-256: ccc5edaac3fb0bd18583f89529cb4f02fee40c4dc724b84f6a644b0861a28301
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 11252 bytes
SHA-256: 1f4939597d290744491566862a0c76b81e8c61bfa11cc9d0218fe6cea482c24d

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