Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1710767efb1b6b…

MALICIOUS

PDF

91.1 KB Created: 2021-07-22 11:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d85c481e0c00d353cff1bc053374a20c SHA-1: d3d63b7a882a3a692659462e986121cda29e8050 SHA-256: 5c1710767efb1b6b43a83c5617f331da85ab35cd27828de1078ca70703d8a609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while numerous, do not contain explicit instructions or scripts, but their nature and the overall heuristics strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b85f92094a7d3b9dbbcdf73fa81c520d/mumebawen.pdf In PDF document text
    • https://dukra.sk/editor_uploads/files/44751697794.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607524d5e58ec---disuloxe.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f47bc9903---jepoxilexebume.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/30329635517.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nutovuwuselefami.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/72094327445.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621175088.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/3330279963.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a6774d7fad0f610c28d7cfbb84403256/79256267887.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/26656169670.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf051176d1---18201767253.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/vulobebogomanebowov.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/guruninafoke.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b459e7938ab---71561993839.pdfIn PDF document text
    • https://inncredel.com/uploads/66636019949.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a64e0bc977413607aa148ffd0d431b8a/69928938923.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/5965159763.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/10442164060.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/xugoxuvibavosal.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/tebefitunagilefoze.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bc068524c---8023786342.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tewamupedusilelasa.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/rimidanerabevenekin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+time+series+dataPDF 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_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17664 bytes
SHA-256: 5770c767d7450c2536ade7f786370b6eb3c237f5c4b18590aee0b549bd57ca32
font_01_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001462e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462E 10644 bytes
SHA-256: 810c0afb9a46b930a751541db720ce259a693a3c6bc521ab29afbe9da4416927