Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31e34c0d6d3c44c…

MALICIOUS

PDF

95.8 KB Created: 2021-07-24 03:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b7992dc599aa1430a3e262e3c88292e SHA-1: 67d0a04f30ee58b5020a96f7f27e6c5a32dac1bb SHA-256: b31e34c0d6d3c44c180c3f9c9b518290f26b3e773e4f2cadb043ed209aff3c2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3db3e6f2e0e528c1c0d358ea01e9df3d/12084090254.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/65ccb47dd7681f587c6635e71f810818/pigotitovuferoregegono.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/16457289776.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/54890864148.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/66567048311.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3a1889cfd144424a7ce4da2d420d9c3b/dazomuxadesajolopux.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c0c6915aedc02978510c4b6673bd9532/soxokawewafe.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7db8baec---bupul.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/87136809991.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/vojapugusesadi.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/16240351213.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d14f3f44---fotasifoledosawemejamepep.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/84462861259.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3908d03c---28070701852.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/gokarerikuririmonemaku.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumagexavurufa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c917c116a24---370206623.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/78602079734.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/jijowokivedur.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2503161a2---lebufumurot.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2a417281ca1e0e562c4a9eda1ea440bd/24926306386.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/velofajowizit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=python+3+django+tutorial+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_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 18296 bytes
SHA-256: 59f395a678418da54f6e4726db6b81545b3314ce1fbb9aead39253f455718fce
font_01_sfnt_off0001405b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405B 10992 bytes
SHA-256: 186380ccbe62f5f95be4edaca75d7fd59c5e842006a18e4c5c4980a665cc2e63
font_02_sfnt_off00015998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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