Malicious PDF — malware analysis report

Static analysis result for SHA-256 079b6fd4779960d5…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 22:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fe8babaf897ced4fd47840cd4bedbc00 SHA-1: ce3df03d459ac3ef75c5f9890a569cd73da87099 SHA-256: 079b6fd4779960d5127d5c54d770c919deb1a2449aeb4c83d762323ae24dee3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://forglass.sk/userfiles/file/88521801777.pdf In PDF document text
    • http://wsp.pl/userfiles/file/laxatixexuzodelonoguluz.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/78877959009.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3a9ec5ir4m8l06fe978k3thnt6/54655641274.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2f52lr9qh4ald4unovin1r0vb7/mekujulefiwewagirimuro.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59579508203.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/vavokoxokimab.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/94641168374.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb4f060ce---gejelupuxovemagunemuzesub.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607226c6429eb---5401978433.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/91292246822.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e71c7e34828ccc3f1a25ab1c7346894f/54825552833.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/dilonawemivanoledafika.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3usnirkuqm42k9qdb9afsoherf/mofujumerezawutijapopepaw.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/t4tr6o8j1cueuh6tipd1hqpn7k/47291262511.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/de975886d3b64c1d67bc18a75fd4f333/44955782913.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/mixetefexataravak.pdfIn PDF document text
    • http://greenbrier101.com/userimages/41490941665.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093088f621cc---sikejakifovoxevo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/svp7te140h53pm58av1vpe9nsi/ruxepiwarelanikona.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/340a05bd80d90b8fad381f1031cff178/juriremiranujogutokutajol.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/18489293526089b40813899.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/noboxuva.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/70953954533.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/063c6c2f0a299ee86bb5aeb91dfd523c/japula.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/69157d142a3a34ceb8cea4714cb7e178/gewebevade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=blank+map+of+east+africaPDF 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_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 17312 bytes
SHA-256: 397e052d46c68828e28ce163b59e68a76fdc2421c9f6be339203d2e86b1185d2
font_01_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 10784 bytes
SHA-256: 516c763dda0e797bb91108731a9dd8049f3e611d7863c213fe25c02bf69c868a
font_02_sfnt_off00013b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1