Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d1633392a3500d…

MALICIOUS

PDF

102.4 KB Created: 2021-09-18 19:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c49dd26864a6515f9f9f08d9f600038e SHA-1: 3cae1cabf03669e5081ce2844c1e10e9928cb29a SHA-256: b5d1633392a3500d6865550f8bf34e05bbf511009fbb22312b1d48350c04259e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a lure to redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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=hack+pvp+pokemon+go PDF link annotation
    • http://tiszaikaland.hu/upload/file/zozomisizevugutelamasex.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/79620256832.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/29296060495.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/33576593285.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99d2def63---68939707645.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nujutipuwexep.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/giwumize.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/99266664864.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/wawivotibeta.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/47106524332.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/51135369440.pdfIn PDF document text
    • https://theipbuzz.com/images/file/towefulofaraf.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/liral.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/75edbc429a343506031c739e4cf4e751/tuxumevamelejejajoxe.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/kidisiverapixilerabox.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/titisiloverikigilipor.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/23390718726.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/88690925013.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/40677914693.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091102325673499.pdfIn PDF document text
    • http://fkhd.cz/data/img/jesibenofezoduwejir.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/47985943650.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/54151645629.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/52879473509.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1bb4105a55cc488d925e649d36b51587/nukorokirabusot.pdfIn PDF document text
    • https://dm288.com/slicice/file/61639539607.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_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 10360 bytes
SHA-256: 2f3d1ae51a5d7cdc04764612898f15066d9840b34c2bf972b1f2b195b4145eb3
font_01_sfnt_off000144ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AE 18172 bytes
SHA-256: e9f4b96271f02e5dc457f93391fa2d1a9944dee88b502fb93811a959db3173a2
font_02_sfnt_off00017443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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