Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5727758ce3d85f…

MALICIOUS

PDF

95.5 KB Created: 2021-08-16 14:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6454a9e0f90273b09761cccc5ff82d80 SHA-1: 9e675386c4f4b08fc046e752f29732c0634cd8d9 SHA-256: bc5727758ce3d85fd780cb7a873123a3d158ec65396dd7ddb63ec5c0f762139b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ilsogno-bomboniere.com/userfiles/files/judina.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81970707f8---balamebodajiso.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zopuz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc65c8f64f---8883209386.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd9e94c7d---26869279232.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/96915736753.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2e669351ccfc61922d3cc75255c3822f/pojuzapose.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/78664118795.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1c4ddc108---3842655346.pdfIn PDF document text
    • http://funperm.ru/content/file/74873044574.pdfIn PDF document text
    • http://zimmerei-possert.at/70011924233.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a090efde5e2---50539605932.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097f270b7f56---rokuzukilenimokakovozuduv.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9ddb275aad98340f6694287429b26c7d/jodilebiwigadera.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d3053efdf8c95c5fb98b3da098b6ff76/luxadeti.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd8e0701c0---nasone.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608607de08a3f---72322154218.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/37ff8a0f798e638befc9158e1a8041bb/71662103325.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8844cd89b2---navimisutisidakaxefojinon.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/6502521994.pdfIn PDF document text
    • http://rsst77.ru/upload/files/dupafazelafeb.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/072d0e9902d053319f3850f901eac856/6257299310.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/zupotinuxizapulositot.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e4g510db458b7ep52sskbu95q9/97410905615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rise+of+kingdoms+beginner+tipsPDF 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_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 10908 bytes
SHA-256: 763d60bbe2b657d088532cfc2777e95d21021f5ba28367d478d7375ff8ceedcf
font_01_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 17016 bytes
SHA-256: a0a9f89bc47f0c1b776b1efb398ea91870a3ab1f2d7167bef384faf1968754d3
font_02_sfnt_off000155bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1