Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cecc22fef74e7b…

MALICIOUS

PDF

104.1 KB Created: 2021-07-24 07:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 052cc5780ccfae9528d353e59e32608e SHA-1: b71de35012c811cde2210cfb6ec5deb066a74fc8 SHA-256: e7cecc22fef74e7bd1094ef00a5b3fa76e06d195e7c3e9043e366f635feabc9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple PDF link farm heuristics and embedded URLs suggests a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick users into clicking malicious links, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf71ab319c---89805970372.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b71fdbbb49265302883f5d7fac700e2f/3081623372.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/jumabomu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/jagifipudusu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4f7e0fac---wamepifoduwajodunubutuf.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/7304572841.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1577ffa5a1cdc9bd48db0263c0bf161d/zawifid.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a279a3409f997dd6ee2113913482fa52/xupozifevotopisirot.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/82210728424.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/15738052836.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/rujabezajan.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/karubode.pdfIn PDF document text
    • https://brs.jo/userfiles/files/54296959395.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1002b8799834c8718dfd9dd155d10651/zoropukafodinigijerikeko.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/wipufinenawi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ded533b2---8043333547.pdfIn PDF document text
    • http://beta-rc.com/upload/files/vusasenedesifef.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/64164820621.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19fa6ea5---sasuzezumoxotinaxamo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9d50e877c1c23f8f5500464c379f205e/meromufuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+refrigerador+general+electric+dos+puertasPDF 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_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000149b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 10888 bytes
SHA-256: 6f9c91b13d7fa90d97c311bd960d623dba4cfdd2e063c3a5baf94aa2b83bdb54
font_02_sfnt_off000162c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C3 17932 bytes
SHA-256: 1af3080d6af0619744d2abd9f2484f84c96e748e27150294ba0079743bf36a46

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