Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb5ace61312c07f…

MALICIOUS

PDF

88.0 KB Created: 2021-09-21 13:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84d1faa889b81e05908685437f7c15ff SHA-1: 270c7aa2bc6ea8eb07cb780415da609fb0443426 SHA-256: abb5ace61312c07f107006bd93716974ab5b705328f0d4a30e0cde4d0a54a92f
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, which serve as a link farm to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of callback phishing lures suggests an attempt to engage the user directly after initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fpcofmacon.com/nbloom/fckuploads/file/mumejora.pdf In PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/fitowobafasa.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210919_057F2C3504DAE3E2.pdfIn PDF document text
    • https://cristalensi.com/public/File/89913728468.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161363cec53b3c---97163065679.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/genowad.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161433e0517e1c---9504142729.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/disizipowizepafipevawu.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/16510348275.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/rerirekuwopotopuxidijab.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/52185219582.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_0CFB384C9BB4EABD.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/rebegomolasomabutupuxav.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/74180595109.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143307991811---ravesakakuxokupaz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3ce93d2c---jurefaziwuwatipesisowi.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/10674355317.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/judezujafisuwuwomowigu.pdfIn PDF document text
    • http://novafish.it/userfiles/files/pojamegekofonofuranot.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/71809320495.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/52826432147.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rigolamirimug.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/96460961161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=clean+residual+files+androidPDF 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_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 19968 bytes
SHA-256: 3dfa663ef5272ee7f2cf8f09168806b5bb009390b2df6fe92995b3c9172fea5c
font_01_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 10380 bytes
SHA-256: 4695599c2a69d5e386f964e05a71b4ffebed494201c8d1a8754a45107b9b8c03
font_02_sfnt_off00013a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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