Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac87f4dd37bf72…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 05:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f181eefb96b63f9a808104755fb5029 SHA-1: 707e4b7c59d223389eee235a62587ef9c9eaa74b SHA-256: 38ac87f4dd37bf72bbf42da6c9a54bd1cd16ade9d204293c4ca265ab4edace87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=dog+and+women+free+sex PDF link annotation
    • https://listocrm.com/userfiles/files/35530227826.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071e423cfe1c---sedomusovipi.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd2e2e9b5---6358249396.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/bemewofusa.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210715_3976F24974F8A422.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tekupoxugekabexuvasiwed.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/56408451007.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b597af8ef70.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/zijowanelixoranabepogined.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/451328271.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/mivanopojinuraxewebif.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pomubigolugovomipokereg.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaa4fbcbea---kalod.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2aeac7fb---96630940382.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/108f44809a413e9ab450da79bf24f4af/28289461301.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/sexuxilakipizuzavewitet.pdfIn PDF document text
    • http://acelybio.com/upload/files/diwapozuri.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/tupalogalulomixagov.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gkqstre9jjkm7m95tje31uh7k5/kumovifurubajuvuz.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070813001488.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/80284868352.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/sutikogopa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///15717247718.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/23229128291.pdfIn PDF document text
    • 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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10648 bytes
SHA-256: d7651b8294c43eae973f063ae00b2443c69747b3839e34cf68dd9a568ef0a48c
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 17612 bytes
SHA-256: 53befb0fa6fa9f40b52da406883dab521a235947b6c8b8acdf34296967168d74

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