Malicious PDF — malware analysis report

Static analysis result for SHA-256 894487c4e235fd21…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 05:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0d6993412300a0406b71393aaa24719 SHA-1: eaaca76d9a568db8af041289ca0c9f117e63810f SHA-256: 894487c4e235fd217509050b8c6e607e55d189ba5c5618b4f63123766ff13490
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/475b1a844af15a562aefef2e6db7121b/65821349262.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51a135d97a---mivegidebaxiwupu.pdf
    • https://atlastoursntravels.com/userfiles/file/bemiturerojisaketefif.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d40c9g8u10vio60ftvfjjtdscr/tefazaponikebivasap.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe6536420---40064107856.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/af5a80797b79bd8aa522419a9226818c/sasoterodukowirolelo.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/85869296829.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7909ede4---2425629076.pdf
    • https://alakharia.com/public_html/userfiles/file/vewasewexibixapi.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29d9041fd---15802976989.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b4276213ce7370c03f14440a34dfdfea/9004875830.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf9e878dd---82781621225.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a444241e730---levukefudebedobiruve.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7611e37bd620b57b0d71e697142dd697/xafekerofanuzafogozomedo.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3a0sn15d4jd4atkfel6eu37bkj/96970882265.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/gpc9thnn51gke2p0j9echgpbf9/lelunesiwulusanudusit.pdf
    • https://magyar-logyogyasz.hu/fileok/file/15796475591.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b546a001596---somupigofukogatu.pdf
    • http://shinies.ru/img/lib/file/wegegogipa.pdf
    • http://candientu24h.vn/webroot/img/files/jipewosaran.pdf
    • http://colorfulmedia.de/fotki/fotki/file/vogupusibasovo.pdf
    • https://ottenburger.com/userfiles/file/39489922780.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6cq86nb06fatb8csh9h7rcot05/79459312311.pdf
    • https://newtech-utm.pl/userfiles/file/69161033986.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=magnificent+seven+remake
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ba.bin
d1b0b035d7fbdccb5cbad6add93f6465722fbcfd438ac21d89e6f2e2f9fae158
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 10664 bytes
font_01_sfnt_off00010d35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 16792 bytes
font_02_sfnt_off00012547.bin
0dc2e1a11442935f82d1cf063a43a3e8c93027e1e3fcae08d3ee352530ffd76f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 17536 bytes