Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2095ce96fd5206…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 08:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae35ff16bc794fbc1f690715f4c5a1f6 SHA-1: 0cfa89074eca0bbb3575ad8c8c31ee0c02828f7a SHA-256: ea2095ce96fd5206c4b8a8d4609396950e88f1316705988c8dacc144e789ef07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, potentially leveraging embedded JavaScript, although no specific script content was extracted. The primary attack pattern involves directing users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160826f3d1abe5---nepirawesodemitobijizix.pdf In PDF document text
    • https://serviceservice.eu/userfiles/file/98038609981.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3f8df12848a0cebdd54af71a31b7250c/15310311274.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/488598136.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/36480117689.pdfIn PDF document text
    • http://abwrva.com/uploads/files/30590780290.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1a45fd8b---46345730149.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/delunafepagaloxinixufab.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/4230525600.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/lojugoloriforota.pdfIn PDF document text
    • https://istanajp2.com/contents//files/50882125151.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077165ef2fe3---goxexubuzizufagu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960aed8213a---21835904744.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/71828817991.pdfIn PDF document text
    • http://beiks.info/public/file/84531652751.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/70b95f221e801c3977b73c266bbe6433/dotivosobagirebevudavav.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f3b42e17695091f4681beb3d14930477/xobilevexiru.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/86161854027.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cc9d7481f---57801436122.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/33860438179.pdfIn PDF document text
    • http://medrea.ru/upload/files/xipidivovotubikasoxasifip.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/vipigarumokanuzefimote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=initiation+rites+in+mozambique+pdfPDF 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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 19424 bytes
SHA-256: a157db5325c5d737fd761f3b4529ddc924c4cbd3abf898cd3d3e4d322fa66505
font_01_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 11008 bytes
SHA-256: 15b94aa4f4729fd3e5bde0d578ad72fff72367fbe42a92ca6bd391fb99c068bc

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