Malicious PDF — malware analysis report

Static analysis result for SHA-256 b291823ec0e2e8ef…

MALICIOUS

PDF

80.9 KB Created: 2021-08-19 12:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b9a5fd31f6d1aa7b56b880d9aa798a0 SHA-1: 2ca5f618e00ee2d7947187a38f515c281aadfa60 SHA-256: b291823ec0e2e8ef13a5cc12e8ad32dcf481230342a9b5678cbe7d12425d8a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing or malware distribution campaign.

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://albino-pitti.com/pub_img/file/zawelososojetatudoboxope.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607981b6a925b---32412960688.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bfc1a7a2e---86320914188.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/73531450983.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/wowifedu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e503c734---65236755817.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-11/20210611051531816274.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/74713769553.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/lf3qrkuhuoka55kkn9rccdm9pg/lisebatog.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/toxup.pdfIn PDF document text
    • https://nevisnews.com/userfiles/fepavugele.pdfIn PDF document text
    • http://whatdwellswithin.com/file/63176907330.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/zinevi.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d06c4914---zezufi.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xaxukalufuma.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/17939865176.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/kubuxuma.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118cfb5d230a---pizalokadigoredus.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6sh0don8hbjgujcp5a3gfjk8ki/lavoderupitikumewobud.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a04111db87130a2a70385d65bafcf3b4/zowafibovuvufijavawa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acb33567e93---selabewitawisuxafulewip.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/251589de575b0e7574661dbba65b6a60/mufakudigakorugesuj.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7m65bt0gis4p66m85087ernsd4/30273541737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=business+plan+sample+online+clothing+storePDF 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_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 16260 bytes
SHA-256: 526733729c03d01922d60aab4bfd39da1532d26207dfef3b4f648a12d7f3db0a
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 10976 bytes
SHA-256: f180c18e850036900d2e8bca7485be78ca522fca6edbea06eadff4c1f5b241a6

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