Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c3a619aad2a2b4…

MALICIOUS

PDF

114.1 KB Created: 2021-07-03 05:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5536a79b3e754c0ca994253ee0d4d7fa SHA-1: 5ef64a6d5234f3f6840207b0a6488fbb942aa161 SHA-256: e3c3a619aad2a2b407fc3e2e4430d92af0791ba04c1280ea4d102268fb030968
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern. No scripts were extracted, but the structure suggests a payload delivery mechanism via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/15f8ce34eaebea7a6b6b2d8b3893b4de/pokobevopokopur.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k0lrk2paqentrunrknguheloc3/lelifojivometowitan.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8f40dcfa---puvagepodotupebadopumexiw.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/14295731282.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85e3074ad40aca84cbf399fcff4bdc2e/zulilabeworumurifar.pdfIn PDF document text
    • http://orem.mn/uploads/files/19114736131.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//25696094302.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/84203628292.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8008371463---sezibepik.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/suwerefimajakapusubonige.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6f418c3dd5c2377dd6342699e62253da/wotulokelolebaninizit.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/4063758630.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8531524ab3---34835310459.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/poremofuzewo.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/72113444522.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/75cla8fmfkp9s0k80ispk4d3d3/35991927402.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7a4f54faab39b2d31f6b16f381f26321/lepusum.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/fumenisotovisezegob.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/817154145d1eac44879b27f42c05b299/peparapoxebeto.pdfIn PDF document text
    • http://homeopathyhk.com/files/86809026080.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5e8aca4a1770fafbc91c37c43ce035a8/3677836237.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9695eda4af2dbdde7f72c6bc97a0d259/20428595391.pdfIn PDF document text
    • http://aven.su/userfiles/file/43738967922.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/87327184365.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210702031431.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/natamapelizelefubitevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minding+my+businessPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE3 10412 bytes
SHA-256: 54e1baf2c6efc9df920f79fd8eb44dd1f82967b4aebde39b484126aee89a5c56
font_02_sfnt_off0001572a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572A 16980 bytes
SHA-256: 8672b20c85dc5bf2a4db8478f9f1cd7a0b3e264abaa17380a254f7adf84ddb08
font_03_sfnt_off000189c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C3 18052 bytes
SHA-256: ce189fddb66a6fd5090c739ac0dd34472abaccf5984ecfd5254774cfcef05ac4

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