Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd890542e1d7925…

MALICIOUS

PDF

89.9 KB Created: 2021-09-03 08:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2dbcea429df697c57dbd9d64205c78b SHA-1: 83fbcc7b156008db538e5fc363c6d755da6aff6c SHA-256: 5cd890542e1d7925c49b95ead71fa1a6cee112e8eb34f3038acce0bbc154d87b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with many embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://fontanarosaserigrafia.it/userfiles/file/78099648113.pdf In PDF document text
    • http://michalpavlicek.com/uploaded/file/firogakifonanuviluz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/72af2061d87618f451ae77401fe09175/junokodo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7b4cbf4608e71cd5f3a2563dc8b3645d/wesuriretudif.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/18691350994.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kepasufafenezuzanip.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210505071720.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f80a643bd---mozukog.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/11b5416251d4d35386a4c5b9f355a1e3/rumujepewisuvujefokopu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aed4600f2---65113513177.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9f7d6181edc2aa1a980ea42cb6c38342/pitimizomubenosumek.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/1578538418.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/sivobivorirukojepalaj.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e26157c14---vipuvikaberiviterewade.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/relenasavorasade.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/ferowebaxitapubujixomajag.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/dovowikazutujujeroxil.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/kisizuvoro.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e367aedcbd---mokuwufaderipegod.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d154a2ca---kisulilaxakosu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ul9ucs6c3v6hen3grq64krfntl/58257042296.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16123b64644c42---muriboju.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/76829121165.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/bofukomibakazamebu.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bd38b6636509c55a8bcfa4a319420f7/90275535473.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/81774226512.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bac1i7kovumt9n4aadb3e0a039/jotibatelidigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=decoraciones+para+el+ba%C3%B1o+manualidadesPDF 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_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 11024 bytes
SHA-256: 36643e6f27a6cd897087745499f76667e411dc7fd3c74329c6a0f179890efa1b
font_01_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 19084 bytes
SHA-256: f48c164a1dee15d922879f15a738b557949df287210f67d24d78270584a8a358
font_02_sfnt_off00013fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1