Malicious PDF — malware analysis report

Static analysis result for SHA-256 1556a0bf65e6dcbb…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 00:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07ede2370758e930322360f8c274d6c4 SHA-1: 14166cc486dbb6864d6aa00e892d9c9f94702727 SHA-256: 1556a0bf65e6dcbbbf1d5dfcaa3065054b767952181431b03a34a3efe4eb96e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583f9461b5---81636448890.pdf In PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/535709379.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/56781644818.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/aab9ec8d7ebe0c901109caf762ca9b3e/37552918273.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/diladazolivep.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/54294222151.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6db2d447---sexisat.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/59237319987.pdfIn PDF document text
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/fanipa.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/o1ki4qjf4f8lr1natvo2t4r803/76272055609.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xalepogodifomu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0512b5e8c7---newawejusenirafazubewivus.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/nakobafulizusabalujel.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/doluwelin.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/tefanatizovafal.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137afdbd26---vuwulesefut.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/rapevaxozugonumawufokule.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/76574091548.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dujobanowanevowupew.pdfIn PDF document text
    • http://rooptex.com/uploads/vobijerube.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3270efe6a---60473794996.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/40813521669.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c60679041---korupef.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/14387216698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wolves+in+yellowstone+worksheet+answersPDF 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_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 10556 bytes
SHA-256: 089ccb1364cc0202b6e51e98e5881414071e8d9f762be8d1f2338d9b13a0de76
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 17360 bytes
SHA-256: b4eae898495d0dfc73a3800de09ebd83c85eca419477babcbcf1d80f0bebe842
font_02_sfnt_off00013abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1