Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19ce610cd42df4…

MALICIOUS

PDF

100.0 KB Created: 2021-09-03 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf6b0efe398531eadd1e5a95cc751b7f SHA-1: 0a797b748b531148b023784dd035b82a7d808502 SHA-256: 7b19ce610cd42df41632127da42482e32e406adb034f3e74335bd159df71a89b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these link farms. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pilot-market.ru/new/files/file/75870068246.pdf In PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/69795603983.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e5cc398---vekepaxotisitonirug.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3e7d132aeb9c11d613a617d729aa8c79/lonikazag.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/dizivakimep.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/busapefekufixevixobaj.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b445fdf06ff---56828980089.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f0fde48c9---rosunije.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/wivozimujofaxi.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/93489738710.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d6d09040---miveludaxexozili.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83bc30bd34---vafixofizewegazuli.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2e474c38---1591316291.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/25513537808.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c54b8278---gafofuboromod.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/52876116576.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cdvpvfu0l62d7ntifce73g22t1/88783900731.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57783a65da---27939557637.pdfIn PDF document text
    • http://tfforming.ru/d/files/fulabumejige.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pb7er3vmm0ergc3o9b1u7d2fi2/9930685042.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-24/20210724165914181207.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/93266973751.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a34cdf6aa---36346010419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=crisis+social+definicion+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_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 20184 bytes
SHA-256: 31c82b70e6531d9b58784616b0481f4a46d62e7bc07c3f0354473952dba871e1
font_01_sfnt_off00015273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15273 10544 bytes
SHA-256: f5aea18b1a69ecd44d74bf97ced521237f464094bdd9b9e75cdd36c80d922d82
font_02_sfnt_off00016a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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