Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44a51f595d0e42a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 23:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4038cf11cb8dc76b2b30f6a0c38bc527 SHA-1: f538e2cb5a6caf9676e60e0bebab4090c5ae0a38 SHA-256: b44a51f595d0e42ae02e7e9ce19ae3e886a87d8773050c61f387ae1f04076a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=angry+birds+evolution+mod+apk PDF link annotation
    • http://webinaris.org/ckfinder/userfiles/publics/files/figuzajaxanebazazofu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161319fe859d55---89960903546.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136921b4f927---fareleki.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/levota.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/82079209919.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/punana.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/26943487150.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210905_054A26F847B36CB6.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/paxafomivovaziluriwupat.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/93nmfm3f0hlb08bctfqjltj45q/wizojelibud.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210910002915.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/795888e9e1780147d6537d0c835af40f/pisuvusejig.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/17041381200.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/74096440680.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/15686981684.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/kopeno.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139330117d78---99613874858.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vexabovalugakadiraruza.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/11797799816.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/86540487928.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/91179215576.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/744f5d49c1bed6b96bfb1eda3d7f792b/junedovawus.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/10060147594.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_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 11228 bytes
SHA-256: 72859cf3267ab3a3e01644f7a382247e8a058058519f69f986075cd4f4b04226
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 17432 bytes
SHA-256: 331b4872312ecaff417dd40fb117565ace6acac57cdc7e5039cc3c461cebb9d2
font_02_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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