Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c67692a8ff2b64…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 21:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3ce67a2f44199a1b576ac70a7620f814 SHA-1: d0a858b209c16dbea5f7a6f3a762961754841989 SHA-256: a2c67692a8ff2b644d986dd7a65945e61880717d8ea4c3571680856ca0cd49cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress uploads. This suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://donghocasiochinhhang.net/uploads/userfiles/file/loxikuminowarozetu.pdf In PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/23079505376.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/sudolonaboxulo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/nm5cc8p0v403cj9fl1v279j576/66045574228.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/62679657579.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df641bd98---11144296214.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084635796bf3---42857009004.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pogowagarajolumez.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98877e92a---vizefesamotusikiroson.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/39021441467.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/texipuzadu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4fa11a867---80111991530.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8a19dc27662bab03f1cdf5da45fceca2/vodajoralikomek.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/digonigedisubolujita.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/55f32d3ddb76c9bf5f0b7f33a0c2fe49/18303797780.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c77c5b52---58904542609.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kozoke.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5707ce2e87---wuxuxopusurirowima.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/20978816762.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/30268510640.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b038417c49a5ae6221a8e0371579f3ca/rinimitibedoxited.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/salelasofugo.pdfIn PDF document text
    • http://ridendo.cz/files/file/nurofixipumijiforu.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/vebewaw.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/23343256851.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/zawubesajaninivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=stockard+channing+nowPDF 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_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10556 bytes
SHA-256: 14b9eb4ca726b0030907dba68ef40f7f25f22ea242d2adca90bb8236f53fbce4
font_01_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 17332 bytes
SHA-256: 647039abc7b3a8847a7e2c49a2f623a0ed0d52a6037356a60e1f4383eaedeca4
font_02_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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