Malicious PDF — malware analysis report

Static analysis result for SHA-256 b891c749e5698cd5…

MALICIOUS

PDF

80.2 KB Created: 2021-07-08 23:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e27a16c5ceff64947878849ab201837b SHA-1: 7a3e7ed277a037d167db7c8c2bb031e87ead0d03 SHA-256: b891c749e5698cd53bd3471fe221a2bcc11c00e69524d72c8345cd0a8d5226f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage. The document body is unreadable, but the presence of multiple links to potentially compromised sites suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e83593fe---puwupexam.pdf In PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/79312534736.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/75156727499.pdfIn PDF document text
    • https://dm288.com/slicice/file/gisurilitulikumi.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/vazunavenumizelivenib.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/582ac6da3b3b862f84d964a89f08ef53/25407718393.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/53257700642.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c6d9de69e4f68f60e6e97ef9098a1b5e/gidunedageze.pdfIn PDF document text
    • https://termocasasrl.com/file/zofikutabo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160708027ee2f7---wadororinukaxis.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/316aeb5135e1a6c6724eeb57082ca933/muxogawolupusarenilune.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/likojipakenonegirolel.pdfIn PDF document text
    • https://yuss.it/file/tasid.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a484d7abb79---kitukoxebedesekok.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b98d502---kelakijamunezepelemug.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f77967bd---rilojomewigozorinob.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1340f69bb8---57832192954.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4cf228acc7041701fe0c690cd7d360ab/lufen.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19ceeec07f---renagelusijupeloguwe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c945676f2---66521902642.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72d43be0d---vajekisuwetogu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7ce831f9---fupazuboref.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ee2fb67c99a7351a758de6a62930e204/jerijinozefut.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/25fda9ced77706d406a4b04aca638f1b/zogiwexesalilexagixuba.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/domegafuketipaximow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=goof+up+meaningPDF 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_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 10428 bytes
SHA-256: 7cf6e43d5e5cf16fc75e03088792bc983f257e3b72d8bce37c201ac3576ff07a
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 21372 bytes
SHA-256: e5db2618b00ef500650fb9769db36c63f8e618dc6b8cb716724b044e221f1963
font_02_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1