Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63c1f1b347433aa…

MALICIOUS

PDF

70.6 KB Created: 2021-07-24 00:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 059bbb653ff3ee27511dcb86b01fe35b SHA-1: f6fce2764cc57bf4602eeba3c1250cfccc17ef1c SHA-256: c63c1f1b347433aab696814304084fd9b229932b2f3fdd80a8fd9356d3129d47
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0aae7aa4a---sukoxogiwiru.pdf In PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/o84s6dec2it66b5pu2i4lrk7i0/jojusino.pdfIn PDF document text
    • https://norservis.com/files/files/99601190854.pdfIn PDF document text
    • http://goref.ru/files/file/95984590274.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/zedukur.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91fae2748---wofema.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/79551342165.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210722_C8E372C872E9E107.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a48e00199---xubexejuxumugezajewov.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/84837142559.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35a1a467---jekovijakoriko.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/44ce48f0371542d7422959da11e96614/7915127284.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2e7488ae---fokizutugaluzix.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05acb061d---34707957379.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9226cf53bb34f3f3ae98e7a6c76f76d7/digevaniwelaxabemise.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f1757765e70529579f45adc2023bd97f/89760681528.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607468b35925b---nusumekenodejijib.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4f035903ef32d80e0d0c2866fa28cc9f/71069815843.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/lorokudinapubidolo.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cd190e036d4---53910814486.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1889a25caacf20bf5aec6fbcce434ef3/27174259757.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/81917448619.pdfIn PDF document text
    • http://saptpadi.com/files/file/3024682629.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7qaf0meel47n8fv6efk7k19nv6/roziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=m+name+image+love+dp+downloadPDF 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_off0000b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61A 15448 bytes
SHA-256: 4cba3c2dbda18b7fb1d10a4440cbdeea9e8e2c1749c850d1b594db159eee05fb
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 10512 bytes
SHA-256: 8c5f3bf448a34226c0671a3185abb0f5916ad20ee4e86f340bb4374fbae87809
font_02_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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