Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaa631abc2ae889…

MALICIOUS

PDF

95.3 KB Created: 2021-07-30 16:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5683e830efd8453d22f23378bd98a6aa SHA-1: 608ead3f04fbb25960fd9d61ba843d48f039af03 SHA-256: 6aaa631abc2ae889646d5e95433ea4e832366751bf72409258daf1c51c4d3802
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc8106c63---23785954424.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f427c807a---guvejejitulelatus.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4e055e08---15469396722.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/23572483915.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5468083e---livekifudijadalenesura.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/71906042486.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/vegejemaseduwolumes.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a23e0441d8716026033fd8299edec6b2/12016915366.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c455373071---wuniraxelinex.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/nogotadodupimeju.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a10162bc741---39135132903.pdfIn PDF document text
    • http://armanetti.com/images/xezivudavisozinazeju.pdfIn PDF document text
    • http://berbun.com/user_img/file/66416690829.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/34626459587.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb58c7f41---xejumuguvepew.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca723b6a40---90114623163.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wejaxenusazaxan.pdfIn PDF document text
    • http://bakoca.hu/files/file/20382056209.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/1088669553.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zeviziratotu.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/46074510449.pdfIn PDF document text
    • http://npas.ru/pic/file/13891751095.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8452149f5---71183176428.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/169a89c0acfb67d81b1dc61190ba31f4/diwiwezumisikusapipep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rae+sremmurd+sremmlife+2+full+album+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 18496 bytes
SHA-256: d98b6b920b4be20aee14109afedc0ebfc60fe5d35c100f475d365d045670cf52
font_03_sfnt_off00015616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15616 10908 bytes
SHA-256: d393afa9df449d4aa0cd66d8ee2a4fca63bca24fbf6decf9a573b3bb7dcf2e19

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