Malicious PDF — malware analysis report

Static analysis result for SHA-256 938e31c4b577347d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 09:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2143e1a517b67a7c87872bf932e32d4 SHA-1: 6e364f5f9415bbedbc5997089f3a3e7c610d35f2 SHA-256: 938e31c4b577347d832de3f07165909ca00feace50cde070b70a33b1e0a584fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential attempt to track user interest in specific content, possibly for targeted phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=watch+fantastic+beasts+and+where+to+find+them+online+free+123 PDF link annotation
    • http://www.florentmaussion.net/userfiles/File/teforopolurorenij.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/86823092540.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132949bbb8e2---fujozasetela.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6829a450c---rifevorubizipanaker.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/95077120852.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133253451fa2---lodajuweve.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/woxabagumuvowero.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/19813678866.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/65628156241.pdfIn PDF document text
    • http://rapet.hu/files/zaruwejaxubirubamakomozid.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zeduf.pdfIn PDF document text
    • https://triosms.com/userfiles/file/24839623716.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/9070073702.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/moziju.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c92e877df---badatufegusivezevidejete.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/divelisaxiro.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/53891196682.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/99478921285.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/09225436c02392d5f23a0fabe1940134/nodonudatogusonekanobo.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/7248829304.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/95481506973.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/bonap.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/pibonor.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tageravaxazabemozigewu.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/sewavevak.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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17892 bytes
SHA-256: 2af2c54156d0606d542f375669caab78084807caad2be20b09a6f2beb6862939
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 11304 bytes
SHA-256: 18a4a9717910ad429131cdd006dde6ce1da25c319cb003d90d52590a3f37f1e1
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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