Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b785ca914ad4929…

MALICIOUS

PDF

93.4 KB Created: 2021-07-07 09:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ba85c706af3b3e77cefcb1803ccca7e SHA-1: 4960a4c7133b929e77d7863bc45cae6665e46435 SHA-256: 7b785ca914ad4929f3b854d948d2e72515e07d5a59223a658bc0957a8bde9f24
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on disposable hosting further supports a malicious purpose, aiming to obscure the ultimate destination or spread.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://saunadlaciebie.pl/userfiles/file/weginovipiz.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf891d35a---38331205543.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/7915921998.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/60236156839.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aabe1b84e---57213001211.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/xafavewanufafiwejib.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/rawuvuvakituka.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/rifuxevufazigirugavivedi.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/gulogut.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5878cbea5b0047e1a542c82b94ed8b7d/gixajabeme.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/cea75b46d2c6031ee9cc5376cb241c6d/napisozanorofupebo.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210613135123_kzupw2.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/99508056839.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/j3k5pgb4gk9ab25d0thntttg0g/funozijonavejixis.pdfIn PDF document text
    • http://cecev.com/stockages/files/zisagatirane.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceca21976---23796726692.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9l06t4g54qobeo00f8iuviekqf/70825247595.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/af3e2fac2638a23d7bb6ae038d99e419/xebagurizijome.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/74346999904.pdfIn PDF document text
    • https://actorconseil.com/files/file/vitawadogesafekuwilukel.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607948f9ed4f8---mibamevivuka.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/siwomunefaderoxaditawo.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/kuxudevadajofidoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=non+histone+chromosomal+proteins+are+required+forPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 19800 bytes
SHA-256: 3e6ef041dbf6810f1590e19b5c4c66b086857263bbad0c242323a07cf170bac5
font_02_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5C 11108 bytes
SHA-256: fa57bbe06b12f6e3bf2039576ae683fe4d4530ec555575b28c2e76bf1f436808

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