Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d250976db69aadb…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 15:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d6c1bf9ab40dfcac7463d0fc7849c2f SHA-1: 3daecc17162daed25415acb81cdadc89d49b419c SHA-256: 1d250976db69aadbf3a5474e0b96fef06d8c0d0029f0246d47a2bea82bd55f5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting PDF payloads. The presence of external URIs and link farms suggests an attempt to distribute malware, likely through social engineering tactics such as fake software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a08817f30a2f300d337ac2dbe444349b/mopavawutufosoxunezofafa.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/221136c67e6e7d6b1c4d2b652105d0c8/71184814919.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a57d99475---7606008703.pdfIn PDF document text
    • https://umartravel.com/files/tovefunusinagasitufosibu.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/66911804052.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/kadezawafifujadevizoti.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/79a128a77f7bbc06226cacf2ce7d5e2b/nepobunivabizulerewavu.pdfIn PDF document text
    • http://prestopc.it/upload/file/joveruduzevivelivotore.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f31208729b---93444228858.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abeb567b5---tixubujovifufipute.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a86d41f10---71701206331.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/26627609593.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/b8kopef0r1itdsef13nqpqg869/55055838002.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/59102969238.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/98478106009.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc1c4f361---gupesuwixogibuzo.pdfIn PDF document text
    • http://cga82.com/admin/File/fibak.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/49356350420.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/nenid.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/xosudi.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/debeta.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/211c635e64aa9a738b93d9ad647742fd/99071105952.pdfIn PDF document text
    • http://wjcopy.com/upload/files/78914763132.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/megewiwoloravobebusut.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/podifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nitro+pdf+free+download+full+version+gratisPDF 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_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 10900 bytes
SHA-256: 38fe4ba421172026bfc13b313871bec09de473fa1fb883e134ad1f8aebb4e854
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 19376 bytes
SHA-256: ef6e2cb292148e709f4140b42b069773d5badefa35a1264fff9bf1c49c2f97c9

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