Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd284a05a863e9aa…

MALICIOUS

PDF

76.4 KB Created: 2021-08-27 21:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95268087fba6a41306cc0deca650f8f5 SHA-1: 392d5c2caf3edff248d85157ebd2b50931c2af21 SHA-256: fd284a05a863e9aa8ef054eaeb1daae92e42bcb222d76c9f8b85e5d7120f31e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/788594d404e863228f52504959fb42d6/29228758072.pdf In PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/nabediwifomasivoti.pdfIn PDF document text
    • http://renknh.com/ckupload/files/66841572918.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/78873103116.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/rizodipajuterizeb.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/61318303884.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f457049bf06---dusesipozetanogisum.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/feea536bc728ae7a50c6a9838fa57799/tapolazapenaluvipoxa.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/71925236607.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/kesarefovojow.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/68996939357.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/kimawaxota.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/47856817295.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/41466014160.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/10603261394.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b99dbb354---zufun.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/subeleb.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1djcrl6pe6naijlrb9c1qpnqj1/gemujudebin.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608318bc82645---vadabedutonupuvatoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5ff47d3a0---64956213524.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/66422931904.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/mesafutiku.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/tifegogusidij.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/5nfd7m3p0dlnps87jemjs5noh5/ninojow.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/83984aaa6c3b1e689470fb4262a3c994/dobetixozunujanaxubosi.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/20919767040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=assembly+language+and+computer+architecture+using+c%2B%2B+and+java+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_off0000c649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 15936 bytes
SHA-256: 40cab09f78199235b7f7a82f68c7c6be3d73d991482cdbb1fe0cb959df26fea9
font_02_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 11600 bytes
SHA-256: a76dc4c4af00bf969bf989ee0929977b0d8a3751e5d3f8fb1ab3c83b680f002d

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