Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c91cd222e13e6ed…

MALICIOUS

PDF

75.8 KB Created: 2021-05-01 17:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55ea4a0f7be45ae3a0ccff39a8c3cc0b SHA-1: e4d4ba4f76e743f2929e9d91a03c13cca599e008 SHA-256: 5c91cd222e13e6edcb54d501f15ce9a6f8a51dae5ea9a1e40cf3e976d4278e9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it is used to distribute further malicious content. The document body, though heavily obfuscated, contains references to 'Britannica encyclopedia apk' and 'wkhtmltopdf', indicating a lure for a fake application download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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 http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d191940fb4---bokulafusilepezuziw.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5d98e9f0cc8255c76ee6bec52a5049e2/43307063797.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4128e50773fcddfb9c4dc685455d3523/63465303083.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c016ac04c164a66571372aa42e9a7a1b/lamirutexupevus.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g1tacic62c2uajec8g5r7oqje5/8936849277.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4lvvevgvr6as90h62neqc5h7ub/japukef.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160707d320686d---2937708712.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/754930069f388bd9e638841ce908dcb4/96140230406.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/6oci29eadstf162kmf53o5uoo0/18577607000.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852874e3394---vegakirevewarefemigesu.pdf
    • https://amitadevnani.com/userfiles/file/telokavusitobekodafil.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/839c97ea7083c9ddcb1c3ae276fefb52/zezuxegap.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160830b74670a1---87951224515.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714082e20eb---sawepikaxidizoguxini.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b74307ac378ad4a9a586bc1c3b9c5a83/tesubabomogujedepome.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607200a20c563---66528711998.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42a9c0a1f---38273766495.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba355da06---zurotesewawisirevozeso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=britannica+encyclopedia+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89f.bin
98d06fe88b127aa50d0f2d78d010f35368f45f5293c290764903dfdc1b32ee88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5104 bytes
font_01_sfnt_off0000fa16.bin
449edb8dec9d2f5de0de86dec2b722025b0bcc51c0e9d9f1762b414db2d64095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 11852 bytes

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