Malicious PDF — malware analysis report

Static analysis result for SHA-256 e893bcb5d5698433…

MALICIOUS

PDF

97.7 KB Created: 2021-07-02 04:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5f11b4fb7d66aa3b0bda319738156847 SHA-1: f763e5c95cdbc3dd2cfd2aa6b246c2ef378b2398 SHA-256: e893bcb5d5698433224086140185ab9c964f535cc48ef3c7e411e848a53e2bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of link farms on compromised CMS uploads is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xavubizutukabajep.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/61087a1dc1bd5ae3ee02e0405e3bab1c/67717439335.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ndleg61ass0fpir383rr4gnuij/xodozi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4cf5885e38ba8bdefbbffb61870a5a0b/63434466403.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/vutitedebijelimulezasofo.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/14830315223.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42513fc66---27037595688.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ada4035851de9a8e179f6fdd39631dc2/lotopuvukuzazizopuvalewo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083785b17120---55157003505.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/21773695269.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/17928268985.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/sosimusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a2c80df73---24084885996.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097f3b081ec6---pobeta.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/803c0b89908719db1048df1b9ae12aca/zimomapewuralodirodijan.pdfIn PDF document text
    • https://goodline.by/userfiles/file/63872124144.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c22d01d7---gigar.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3d84079d68cd8f309b55b8dac5c991cd/20992776609.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/fibotaweravopuzopunof.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/20203110989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=metric+ton+to+troy+ouncePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 1768 bytes
SHA-256: 4bf9f9daa8856e856d9b53b4ca970fe75908f7408aa5cbdcc40fc08211f3b256
font_01_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001335e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 18136 bytes
SHA-256: 862beca00333f335747e861791e3b18dcabfab0ddb63808c60a0518258bf69c2
font_03_sfnt_off000162e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E4 10056 bytes
SHA-256: b9c30969b2f9c62664e66383ba91a0d77362e97da9eb352e2a4ebda896aa5789

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