Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49801a9b2e9129a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-03 16:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 67b42f0ee421b10f1568b9b29027405e SHA-1: 59bcc9689aff6ba327d8d1e41d3547fa52b5ca13 SHA-256: a49801a9b2e9129ad2cf6b80989de855c8728cc23e4e2eaded8cde2696dfd597
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://semineebrasov.ro/printuri-fi/files/bewadezanitujativowi.pdf In PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/25862948416.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/36552912827.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1a97bf00c01b71af94382b5c8a1b80f4/majorajosutuna.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83002607da---11556424906.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f97442be5c967a30d4bc893065a9047d/26555296215.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hhvkgiv9qg4hg7ipmed7l6qod0/pijabul.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/hkjfqpl8dq32rpr9m9ppb4r376/54531703468.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098390f9205c---vobexadodukidusemamulexow.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/63107809370.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d863f1c9d61ed0f919a8d6fd915e04ab/bunakizamunerukezifiro.pdfIn PDF document text
    • https://resicolor.com/upload/files/fukeduwaketodizomelimuj.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b56a1177499aab1eb004949f2b134281/8139904803.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/20733949038.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-10/20210710131400456130.pdfIn PDF document text
    • http://abc-tel.ru/data/File/loberelawafazodafupabuxor.pdfIn PDF document text
    • http://lnyy.cc/uploads/file/1629915640.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/62295408113.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/28449452294.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd7b5745a1e9b94ac2d5df2e5270cb83/mudesuvorozoxabunax.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c28a061cb5a---14910671107.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/5908470636.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/109a7b71b349accf33c3b2867d2fd0a2/birufojemarumofedise.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/38821955411.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/90536741609.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/166894d6bf23ca3a6e66b7b0dd55455a/bosofalagenedelexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cnc+machine+types+and+uses+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_off0000b6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FD 13716 bytes
SHA-256: a1ae276e834c31acd44bb36c3f5200ab78a736833ae90418e9fd44d5e824ed37
font_01_sfnt_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 10864 bytes
SHA-256: 30f5654d86656f2885dc58719f45541a09c3fcd34933c5a907993f7bf103be9e