Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c151d118c36dc3f…

MALICIOUS

PDF

100.5 KB Created: 2021-09-02 04:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d1f3a2868a4b215fed4a1d941658e55 SHA-1: 7247dd57298b3512178fdbbb4b41897aa72732d0 SHA-256: 6c151d118c36dc3fb6d438d0d6c1f2524aad6e3b5fae5b073f50edc6d9dcbdc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=cute+baby+smile+pic PDF link annotation
    • http://bualuang101.com/backoffice/upload/files/67508715792.pdfIn PDF document text
    • http://podushka.by/files/files/33900185948.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20823931211.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084058e73852---foxovozubimol.pdfIn PDF document text
    • http://short-story.ru/upload/file/pagonirewebeka.pdfIn PDF document text
    • https://ratoempat.com/contents/files/zodudarazukanisotazogoju.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c16d31aff1ce964a4eb5182188523c7c/18038308687.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/23741684723.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a5c811f2---laborenolugeteb.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/dizedilofodotafefogil.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/77780193445.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1575c2fb5b---nubowuxawewofuwi.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/bogusife.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3k3k12sl51h403u4n2lm177nog/buzoxevuma.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/1oumlnlhe15ner1t8aa9kngbj4/43327823138.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/sifizonagatusuguwarudib.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/96660652905.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/36161487372.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///88495956958.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e85b525e---65039283748.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/nepelorikuzodudi.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/naditaroxawika.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7dd33a3a9---zodufifisosivivuka.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/rijagifisogazujovofamok.pdfIn PDF document text
    • 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_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 18992 bytes
SHA-256: cb88a7599c888dbbde6d25aec0c743c9ef7ade445770d77f029f6b105d0900d3
font_01_sfnt_off0001533e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B55 10596 bytes
SHA-256: 4309187f4cbd6c2862771b632b02a4f24cb4770e8898e68a4531806558d6a023

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