Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cfa7c68437d6f2…

MALICIOUS

PDF

86.8 KB Created: 2021-08-17 21:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46ae7a2253ad790aefc21ad0e1ee300b SHA-1: ee6750cf83c0100748844368473ca4c78e9f9531 SHA-256: a1cfa7c68437d6f2aef29e08a0781d5aa623117d08a6cb389da458698858f6bf
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://garglob.ru/uplcv?utm_term=how+to+use+a+washing+machine+step+by+step PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c86573c1b12---41396991571.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/99290943750.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/fisoligugurute.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea12a69c98---31821735070.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q1q5s781ki1srh9nptu3q23up9/26229635303.pdfIn PDF document text
    • http://baongochoa.com/upload/file/napibuvisiwikolot.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f66bc2fd2---42862149790.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/95727146711.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/vekotanerololadujenovi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160f090cf1f81b---zavugogogebo.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/puxezosot.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g2u5qsk68lpfr0p272p0mut6b6/75999262409.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/figavasuj.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/53751006765.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073952ba5717---35684931971.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/07de3fb03f7eaa6d9ab232199ac1e453/gofuwugejozelugomumiwak.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/14001572792.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef381cc336---pepawop.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/69386549680.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jusimulalotejipedawosul.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/jebisanilivafar.pdfIn PDF document text
    • https://proxus.nl/file/gewoxagowosas.pdfIn PDF document text
    • http://getem.pl/files/file/zefiloninejebap.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/35804638526.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6e8eb427---munenetif.pdfIn PDF document text
    • 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_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 11104 bytes
SHA-256: 3056612aaf2e3ea568c2f420d29c09dfd8dac8fa9ebd1adc162123d2c079c049
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16720 bytes
SHA-256: 38d1f6b32b035e4f725dd778015e10850d5c393dc52e943a231f2396723372ca