Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df1b65024c568fb…

MALICIOUS

PDF

104.5 KB Created: 2021-06-30 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bd44ef2b92a38e6cb9caca08dcc74859 SHA-1: 30a812c9b2dec818bda731342905dab42b0263a1 SHA-256: 1df1b65024c568fb542e787595ec2dc18afeccc7bb610391d6134d6f6478dafb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://arniestribu.com/campannas/file/lelobofarobasufaluko.pdf In PDF document text
    • http://a-swiss.com/upload/userfiles/file/78256221148.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fd701ce39d2e3e5ad6abd0e3ea5fa8e4/vowirotonifedusuwodub.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc383dec7---filigaforoto.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/43344850502.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3810411c08---34499411733.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9b5952f20---27860716952.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/99968686565.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/292052247163.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5174104a466d30e728f59acd130abbe7/18375405117.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/kasefeborilujemuf.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/4554346111.pdfIn PDF document text
    • https://csn-alliance.com/data/files/vuxefofilopisaj.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/semanavenamobisasirop.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/33447065269.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/vemewop.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/61812883669.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f597a030e0---72716903678.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d43a4c6b4d---54391333843.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d457033e---59531689872.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xakovonep.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1543d95976---raxovidu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zirivonakafexupama.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160787d16ea8fb---91195204183.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/820bf6325d9e26ed9c60e3fe992ac9e2/99767104611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=food+hygiene+questions+and+answers+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_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 11156 bytes
SHA-256: 7bdec692639c0d572b0ddb72d577ee0400d0eba611a54b747b5d5554dff7d179
font_01_sfnt_off00014c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C89 18168 bytes
SHA-256: 272481024d3c65cecc1f538ff8126d93589dc9757af152db279b2484f1a23bbe
font_02_sfnt_off00017c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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