Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a5e2b5d411964d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 06:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44f2b19c5a3c82d7eec9ce6803ee4b8e SHA-1: 1592cd6bd391eb4411df68be2dee96125cb27d63 SHA-256: 19a5e2b5d411964df9c2afd7f701add5e2c22e97d518aeb53f1ec708802b4f1e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be directing users to potentially harmful external content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pypconsultores.mx/userfiles/file/53837355444.pdf In PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/gifokesotitel.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/bal22l0vor8grdg6db2a8jnkh9/zegemirifofiviwelama.pdfIn PDF document text
    • http://chinazzjx.com/d/files/25572459758.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fdb631ec---80617447104.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f1e0f03e77b0282d5af9ff3e55fe11b9/19970320171.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/91776426651.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210721_AA83D97064F3FA1F.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/15544482321.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/092b928e717d600eddd47c6f0871d1bd/jirizodilixunatavurevara.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/44082632799.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/gujotuvigazarud.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/dujajezojasopevosekul.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/enllr8ekjn2kqu493dfoa82va6/jajirizevalugugiwul.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7df0fa8dcf09402e1a32d9191a6e7bef/zekeguxalamuzowajine.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jepaxatizikixevulisi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f1ccaf2da513bc6ca055f5fef1d2c299/48253885189.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/6ae4a00dd2d7b162c48cfe84f6733c3b/satorowejugaleloxaxuzali.pdfIn PDF document text
    • https://33mobility.net/uploads/files/78809504382.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/93482808450.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/rovidufewun.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/86b44ed6dbde4379e362a62579891738/83955143089.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/wodegupokulirasejexuvalel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=endomorph+workout+and+dietPDF 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_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 18052 bytes
SHA-256: 8a7f684a6dcc02bc8de9199d5dbaaf44d3b07d5dc356cfa0cc4b177b158c247b
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 10704 bytes
SHA-256: 8781d91abe71127e57594b82fb6f8202e033fff8d96e024925af58148383d064

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