Malicious PDF — malware analysis report

Static analysis result for SHA-256 3179e76945d4777b…

MALICIOUS

PDF

67.8 KB Created: 2021-10-03 09:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4417e5664ffc9ec3d3631dc7983e3f5 SHA-1: f30d06f1c240db91b382352592b0040b5f63b84e SHA-256: 3179e76945d4777bfc627fd937bf7a2ca7b826f028c8c3943148e1382385c5d1
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple external websites, including compromised WordPress uploads, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=fifa+20+coins+hack+pc PDF link annotation
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/alk9eddln458j40qdq0ae3ei74/34865011481.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kififusagoromazekirema.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/sizekewakujapulunod.pdfIn PDF document text
    • http://klenderbio.com/upload/files/dobatisufubes.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/mazezonirizu.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/26162934162.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/tomekutinusujugasumolox.pdfIn PDF document text
    • https://icbacademy.com/upload/files/benapuzuwu.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/fozewizipukowixopa.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/xaresedibibivoduxevuzeju.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5212941f4---bisazosanikila.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/xorupunozujepi.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/rovedobukoxonibe.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/19828505616.pdfIn PDF document text
    • http://generaldistco.com/images/file/fagediwigudimopikenajibas.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/33901352312.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/mokusajimaboru.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e5cd251ef39b335e8892fd073ba08f33/pebadenuluvebodano.pdfIn PDF document text
    • https://inks.bg/userfiles/file/51319168974.pdfIn PDF document text
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/sakosan.pdfIn PDF document text
    • http://llux.vn/uploads/files/51995630147.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_off0000abef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC406 10512 bytes
SHA-256: de7d6ad27350eb516a90755633d1e16251a3df9ba1d1c0673dfaa402a4502825
font_02_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 14700 bytes
SHA-256: 6dced8767de1fe0c2278d609e166c6bb67732ebd786dd0be310d1d9a28f42c94