Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b1524e51d5a85e…

MALICIOUS

PDF

92.4 KB Created: 2021-06-30 11:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b0bac82bee16ab1cc6ceb38320f33a0 SHA-1: baeb49a084d9ee1411bfb4285c2ca7414ff0b22b SHA-256: 55b1524e51d5a85e8341caec53ca413ed48aea0f7d845b1f3fbde36f6c0ddd46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm likely intended to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://churchofgodinjamaica.org/app/webroot/files/pejepaxedasited.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3196f60515---8236743239.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15d775e3f---wovisoka.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a56f917bc03cfc07b34268c96e59b497/95034647238.pdf
    • http://angarakshaksecurity.com/userfiles/file/kefufomosifimoxer.pdf
    • https://fl-forever.com/upfiles/editor/files/14583235782.pdf
    • https://batikatravels.com/userfiles/file/94599989259.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e42d653f---ronigoduzusibemoriza.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2ecb52081a95f2383e2542d70774fe6b/87513491977.pdf
    • http://brenno-tojestto.pl/userfiles/file/61115698753.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/79bafdcd48adcfaf39d5bfb1c751daf3/79862686694.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4fadf4d1c96749cc75cb3f4591b872a8/15334922916.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b407fcc888---lotidetalawozerew.pdf
    • https://autosaloncenter.com/uploads/files/80070939142.pdf
    • http://abwplazaview.com/uploads/files/fagavazaxekodatov.pdf
    • http://cycling-software.com/files/file/sofulajefidivogevaxawe.pdf
    • http://unipsyclinic.com/userfiles/file/20210523054756.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7thftuc3n2mlhoffbs5jo88i6i/84109726760.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tcbn83ac29a32a9b53l077nogt/6384997283.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3qc78dme660uu611mdn6oen5ep/lugupawog.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b62930b981e---tewenuvav.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4ea99d9dedf7a8d55f4de21ce352dcbc/nulofejasetugulekib.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79a2e81cc---pitogijitotuzuruxexutekig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=chacha+chaudhary+comics+in+english+pdf+download
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f5dec0298b4a10a5c874a6c083088007/91584127021.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_off0000f8ae.bin
e62ab6733bb425d65ad77190c1d5d9b5252272ab7cc27cc817257d5fea643caa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 11300 bytes
font_01_sfnt_off000112e5.bin
50b69fd79e78490a24d76a7744c04fc4b40a4ec7a91544e7f9a99e000bd0e6b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 21568 bytes
font_02_sfnt_off00014c10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C10 16792 bytes