Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e76d45ab7276c9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 08:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 015dc0811b68c7c8b2e9e56e7f7eba7a SHA-1: 5ef87ebadd30edcef7cef0eefd6ca3b3bd9abaa3 SHA-256: 80e76d45ab7276c9b0faafabb141fcc6982ccbd2eb1b353278688917df1d2ed7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160994728123d6---satowibabolosafexadujez.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/77199810022.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cff2f3d27---88488704394.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/12607256728.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/manonilenalakulajubawamo.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/17419913164.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/s13eq123p6emkb01kv4pacsa68/nunilako.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/jejikeferuneluwu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wideriminifav.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/71462192662.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bacf84152e88551a69dfa8340038e210/67788665914.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/49235962969.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/74760599186.pdfIn PDF document text
    • https://domilot.com/uploader/files/jedesidetuzuxo.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/15a516c8c5fd2b050a4e6016b6026a04/viviguzojow.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/84251204319.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/pevupanegabu.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/mavedawuzake.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/zomikinidufedo.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/80784100754.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210829030309.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/4202361405.pdfIn PDF document text
    • https://kawanmto.info/contents//files/96359262633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+midsummer+night%27s+dream+worksheets+ks2PDF 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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 17592 bytes
SHA-256: 14ca2c18a04126d63a36b7c12aff03c91b500fe41adca26e2f03b36bdaad3a6c
font_01_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 11064 bytes
SHA-256: d858f8199c2fe4ffc7602518a71157bd96242fc5f08b33dcf81d2d8637353dd9

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