Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffee61aa5afa17fa…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 07:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3be6029d3c83a19dc81bdfd2c9901a6 SHA-1: c28bb0c42e19e03e9737feaf015add0780d86a99 SHA-256: ffee61aa5afa17fa3f3c49d655e5feb6cfcb684fa9bc879c8e39d9a482033432
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs and the heuristic findings suggest the primary goal is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--j1aii.su/userfiles/file/wizafiletovud.pdf In PDF document text
    • http://ch-yang.com/upload/files/9512431001.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ce3dfeab414aeb70b316b96923090ab7/guxodamutirebija.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wowedegifokipukefej.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/98191795386.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/88550724442.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/marorululif.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/56150161785.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387b51df686---nebudegekut.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/kusaxowivepebasi.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/11843791054.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/61503549241.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/belokovosuxozovo.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/11436207886.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/29423997876.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161494352813b7---3482868634.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/25653376137.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6mqq7ugioh6223ttmdq7j0ppnc/74626235663.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/79754376998.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/43607383497.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bmop5b16h2ihlddrpa4iek4430/27403165901.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090404292386.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/65199396447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=set+homepage+on+chromebookPDF 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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 10824 bytes
SHA-256: 80e6b1284179e7389b2f76b88b3369c87d8f42a74a1058c02f05bd641f707d91
font_02_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 15736 bytes
SHA-256: f7b37d4f8db83c7ec652b805ce8f9b86031c39989001877cc9631ad784e0f71e