Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc4b6166866268c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-10 02:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9211c94a8c744077e6d039ac437acde SHA-1: 51395fb97c94bb9ded39e93391c6355ace3034d8 SHA-256: 7fc4b6166866268c7641c8c012bd48847197f1b04cd3a46e42e024071f57e781
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328aeb32110---genipopati.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maymaygiaydachidang.com/upload/files/febawujudikigarok.pdf In PDF document text
    • http://bachtungcompany.com/upload/files/pixowibabazex.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/dexil.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/98203539997.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa7251708---5917379778.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/rudiw.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/24204077066.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/50207698097.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_9590AD53E8BF33C5.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908031339.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/5043784397.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328aeb32110---genipopati.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/52875893897.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dhvn5bsm7nj8dc8csve4ca5tn5/65633857032.pdfIn PDF document text
    • http://zerosquareonline.com/file/muzivapanuzex.pdfIn PDF document text
    • http://baoveantam.org/upload/files/82565961967.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/atrqgs86bbutbmgckqr8l99rn0/10987605620.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/savurusemij.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/jatakekomopevedu.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/22210109632.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/fuzalofixabiporimupuwo.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bilalajisab.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/filodatogapabukobikazajop.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109030352381227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=psp+3+games+download+for+androidPDF 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_off0000b289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB289 11004 bytes
SHA-256: 3013944a76b561a59b818a0879fff3b4a18fb7597196cfc165dbe7fe2fb94c1f
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 15476 bytes
SHA-256: 0654985e85f52d93dbff82bbbbbb918482640da1dc86990520cf8c12a49b0371
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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