Malicious PDF — malware analysis report

Static analysis result for SHA-256 adff5f42604b8bf2…

MALICIOUS

PDF

83.7 KB Created: 2021-08-15 07:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f66e34a21ba641e85075f9dbe77d4815 SHA-1: 54e46bd4ad79fe178c00810c5b8d6f2b18de52c8 SHA-256: adff5f42604b8bf25f3a33e688add7a252e58ce32eccabb69c504b0a5826de87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://nomylo.ru/uplcv?utm_term=new+assamese+film+2019+ratnakar PDF link annotation
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ce38f7e7c0da76af036c8d847946c0f8/luboxad.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e7146e2acc63c23bc8d68e99dbef01e3/jagagivev.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/dagofulugud.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/22655729038.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/90638217276.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/ruxadimotepiju.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/sawasawekavuvunubumaga.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/pojoza.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/bowusel.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/45044d26852b32dcaad97883c85cd126/23185399418.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/mikuponutasawulavopoju.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a3e39598---25583462519.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/narolegoxadutumexezitel.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e85a53a6---47303213877.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e1573c5c---66251516502.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/pasogazenajizulumuboxabi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610480232ea7d---97313873812.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b8b89da2---filepozikolurijub.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/45547723860.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86e4c13089---bufesapebavo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6tbav0i9elgd9pmpr4tesn1b3t/mixavajanumopeme.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/82256085410.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f230da59---60852321888.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/9253375584.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 16404 bytes
SHA-256: 2f2751202a14ee7aa23ecdc08894be7f4559a24ed57dedfb24db04c92e3123bb
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10872 bytes
SHA-256: 2e89d049939f2fd7a9cdbc3c24e3b42c6e7e3dcf0342b8d3e753b170f44c1b77

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