Malicious PDF — malware analysis report

Static analysis result for SHA-256 031c3586d47d64f4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 13:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3d3b2ade0636232bf5e6e9f9a99e287 SHA-1: a1ab19f4e1cb8ce04104f07389ffca6df2399e4c SHA-256: 031c3586d47d64f45124c313b75b4666788dcda0cc745896ebfec2a7f03d0813
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. This pattern is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc48a465fe---20456229098.pdf In PDF document text
    • http://eventechsite.com/files/files/povuwosasabowetesene.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/bawoj.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/57238526667.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6e2055sc4uam1iatsa9squ0jjj/sajewa.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/92929649673.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16110b89dc13a7---45218599833.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/74693036731.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210620_DEF8935134E9C787.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c629ce3e1---basufawuje.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/sodijodov.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e4n493epa3fuck0ggti0o7vnrs/tagoka.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/41210067871.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rupapumokagilije.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad7c2f2da---zojudesujibije.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/86912467295.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5b33a57ca25c46f400e3b4fae1a91ab3/40405735331.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/71193863587.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/949df0ec929fc743dba237bca32b4194/nenuzog.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/68158559570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mura+micromechanics+of+defects+in+solids+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_off0000c3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BD 10976 bytes
SHA-256: adeddd15ee58d2b2e790b0093e9fe29d88b8ab2a5652843e4a9e9b5054c01b0a
font_01_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 21204 bytes
SHA-256: cad2c0c8da40352a4080094f041620f8ca78461d7496d1fcc6060fff09944022
font_02_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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