Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fc92a6f68d3b49…

MALICIOUS

PDF

112.3 KB Created: 2021-06-28 09:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a64ee0dcb315d02a5c81fd0f64970f6f SHA-1: 208feb56532a0a9a166e75bcb679a286ea0359cf SHA-256: 84fc92a6f68d3b49b30308a838251790f4349d55217b360a6e718c8112e9dcbd
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc78e46b3---gofusatumoru.pdf In PDF document text
    • https://aedwea.com/upload/foto/61282523927.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/263caf1aad048c44d33e86ea1c20a5a4/8008479328.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c70dc2175ce---zitobup.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/46814116719.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/70323928867.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b2ba3045---pujozosewuwobuwemureseg.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021050910194773499.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3m84t6o26fbp0ofdna7pckvfi5/96733132512.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae541bf9e3---52718229232.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00510608ce---25457492584.pdfIn PDF document text
    • http://dzbnf.com/upload/file///53330527973.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/341678aab2b7f1e7ac317bbde4301b67/gewoles.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/79645106461.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/futuworivov.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/247100781.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/47684048538.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/uloj29vharrpbg2qpegj8mgn2i/ziwafizavetaza.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28e407cb7---sutav.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/31711530728.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/8f39d74c84e8739c1238d6549ff134db/lamevepatezivipetozemu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d8a7c27da---26908147163.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/i7k5qbdte18b62937ul5el504n/wenaroxuwuwixiju.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160778af60561a---xunezawivumaxewebukop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gaming+laptop+deals+black+friday+2020PDF 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_off0001512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 11588 bytes
SHA-256: cbebea765467435b340293842052cdb487519ebfb6f17c4b95787f49d51cff22
font_01_sfnt_off00016c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C53 17972 bytes
SHA-256: 1c25e2f2d21f4919cdfcd77b426ea02da94985e022585888a886951f1f818cda
font_02_sfnt_off00019b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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