Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c3baf433cfd1f1…

MALICIOUS

PDF

78.1 KB Created: 2021-07-03 04:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d2c205d922c7e132a149d18ef8dc5ec0 SHA-1: a30531778e3d277400e35b3fefbee0d2882a9195 SHA-256: c1c3baf433cfd1f1c051c4b04110c4b4dd27f41520c28b003e8e8d5a6067f845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c013b2686da---31263607963.pdf In PDF document text
    • http://westernmaki.com/uploads/files/vuxusekijarejuwepibuwegep.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xejepuzatebonarizilobipa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085673ecaf1f---nejodilizapavaj.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/zetomulerunodexurusan.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/2980961674.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/23390142926d9f5f9a437c4c3c253965/lepofaxozimupitukulo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641c5bd3b5---wurutizitixidenelelum.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c077728ef5a---82829256479.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e0ad4717a291b90fbfa54744a39441bb/tifibekizogitamegixa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0dd0c964---laxetipugudirafoku.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1a8fd3d62b7870dd33b6fe3150268bbd/relarapojabevo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a14ae49a0---65819962829.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/savexovexemotesujeroxi.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/70427012417.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/46b04dca3e88cf818924bc4f2f988eec/dijinekibozu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160915eb2de9bb---22311892737.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/7288553081.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a78befc2e36---49827200623.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aab2bddcc---33766891558.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/30865656969.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eb87d8b7---kigadofasipelupu.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/gamogewuturabojim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=area+and+perimeter+of+cube+and+cuboidPDF 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_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 10788 bytes
SHA-256: f5d2b070ac30f5cb09d870ecd34402b5293e5fc6bb04566cdf7fd5179a85598b
font_01_sfnt_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 17300 bytes
SHA-256: 751f13546474c873a8fa4ff17ff6d4d5af84877ee2f7f078d192cfdc6ed016b0
font_02_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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