Malicious PDF — malware analysis report

Static analysis result for SHA-256 df64363bd4fa8bdd…

MALICIOUS

PDF

90.1 KB Created: 2021-08-12 13:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f80bf2bece2897e6bd053f13a4258191 SHA-1: 321b46a6fb3645cc559162402e251766ee0741a0 SHA-256: df64363bd4fa8bdd6eb15aa0e399bf2260e958d26ccad606b15a8cd354eb5642
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pistant.ru/uplcv?utm_term=brainpop+civil+war+causes+quiz+answers
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/zaposotuzebow.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2b0c42dbb1b49ef0ca461e20f52009bd/56810101371.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/tijibodanewemabara.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/96ff6c63d3e9a218056b530ec6ff0b1e/9908086907.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r6d8epave1timmpqbf2e9sqlhc/9041142700.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/113dde3c90e8006da5eccb14693f912b/varoji.pdf
    • https://doublehair.center/upload/ckfinder/files/76556505546.pdf
    • https://luyenthitoeic.info/userfiles/file/70292827632.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4qamjs20bjph7uccvd0f7rsobj/tiluwenogiduzibitasute.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919152da54---fefuwujevo.pdf
    • https://zhansq.cn/upload/file/48709889010.pdf
    • https://lienlacanien.com/img_pages/file/557053718.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/gt7bou3rq0ov20k674uaipale7/34730119561.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8856820d5---32614727439.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e823cb397---jolaseti.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/darigonogeverizidi.pdf
    • http://angelcabrera.com/FCKfiles/file/xadesunajukuvelab.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lfnamuk5fhs3r2tbu7tn4vc2ig/6702102072.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2084191d8b31c57b082f35b9f03a593/paputibofutigetelari.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/flcvb3trfqvrm3m2qhbbr5p15i/85334211020.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/51d32828fe793b5895f444a1514f9913/tumimu.pdf
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/63117205737.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3323c2fd6689478be90fcbaf378e5435/zigavegabowafejisoxorepun.pdf
    • http://hamkr.com/userData/board/file/37794804805.pdf
    • https://xo-sound.ru/userfiles/file/70540170704.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c29be56dc426e6cadd376984e6f900d5/73920991366.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 16792 bytes
font_01_sfnt_off0001125b.bin
a41122f8459deda7b12d74092082873c36f00142aeed491619f8f5656f988f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 17844 bytes
font_02_sfnt_off00014129.bin
dd7a2ba911899743af2359f3833da6b8cd4764070854ca0b6e2ef75b4f4185b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 10780 bytes