Malicious PDF — malware analysis report

Static analysis result for SHA-256 2888635e09696fc3…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 22:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 994737b9077a55bd0f6acccfc6c14f78 SHA-1: 7e733bc3a2011c1d9379c267c3c336b13f6b50c0 SHA-256: 2888635e09696fc32478076280e4784b486a421651218c76c273e5e68674fd10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to compromised CMS upload directories. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://miskolciharsona.hu/pictures/file/77616415028.pdf In PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/gisutebubivog.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/80939018391.pdfIn PDF document text
    • http://cmtsport.com/pliki/70558335196.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/89913551886.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/winetoripan.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/woperunibuwix.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b8c4c1fd6ffa26facb3cc9c8e0f63c15/39653340665.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/89376545501.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ee8a7c6c28b8d97d6307117a3e2fe196/mufaxunirobizuvet.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1b8fbd8120a352a0db63c70abe47ff0c/nezog.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nawuvukix.pdfIn PDF document text
    • http://novichiha.ru/pic/file/kolufumebiralefojikufege.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/44753049015.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/41160773238.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/bawenosaj.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/52204148595.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a5ff221ba---22877024823.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901094652582942.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t05eql42qksau5ntosh3glsc3l/52097374645.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109131536135124.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8af9bbbf---dewanegijejakizuji.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/79371005775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=king+lear+as+a+shakespearean+tragedy+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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 18440 bytes
SHA-256: e186406892e5b6a06b49c54b87b39346bf22f8647bc6217f65b01c4fdc63ad74
font_01_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 10856 bytes
SHA-256: 3b7421a2a04d389b3f33dd98a9cac3aa067114964d191c0f56c6c9e85660b3ff
font_02_sfnt_off0001398e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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