Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b35d15b044e219…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 14:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a3c21a22d32e09d9a0bd0967754f0013 SHA-1: c083879321d9e9ba9117d0907acea0f84d39533f SHA-256: 94b35d15b044e2194c055c1fc33808137bebd44c0ae54b397976ee4c394e3145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to a compromised WordPress upload directory. While no scripts were directly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect users to malicious or compromised sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ee4b4e064---2468454099.pdf In PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/62187572545.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/23562679592.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2c41b2d31aee6f8390a68c7ec233cdfb/zimafujonekagitasojuwag.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xetenabugalizibegotu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/24982316876.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gadufoxokide.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f309f49482---duwitiseg.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/46087528008.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ac0637ef---tuleked.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9difqevdimlt7ko7mmvjkg55t2/32601152372.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/luturogi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xewofakakanagifezafa.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/53510969831.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cb763aa4---pivipizilalulogujobuwetu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/movewokodazi.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vufisof.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/36411164814.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafdf2e664---67347702668.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/76418553515244f4ef234163ba6c2ad1/texawajafefomudidewarovob.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8b774645---duwudifasor.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c978da91a850951229e5eac7dd3d11d9/42273259094.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kv724dttmipgk0v7lpelgo85aj/fijevuvobivefo.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/24521821604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+many+cubic+feet+in+one+tonPDF 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_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 10616 bytes
SHA-256: 171cee07aa49b54122d9c69010550d9a21fe8cfcf16484dcd8e0b0763226aadf
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 16124 bytes
SHA-256: eaf02b8aa9862b7f07d50ec3a719d573a78508ae4b6ba3091dca8fed6877ddd5