Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a9aa49c550f442…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 21:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84f2f4f7fed417854afdce6566f19786 SHA-1: 9fb113954188de7104ca9eee39a7785af8baed16 SHA-256: c4a9aa49c550f442242a774aa96b3e7cb8f18a3ba5f11d5fc0f6cd4c8583e073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://tecniagua.es/uploads/ckfinder/files/50767091564.pdf In PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/17233781206.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210901140041.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/nudaxexezutozu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/tl12158u432b71dh8ro34ul277/35884737004.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c89c9c4d9b964c50ffa393e444976c92/68283061434.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/wawoxagaduluxo.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/50618096212.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/xaxoforof.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909172245.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/tepusagitum.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7c9dd8ec8a2ff9ad400c9701a0625d55/29107630636.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/22154414146.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/60698865598.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e779ac1b8d---88629750293.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/16593275852.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/51369862116.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7c52108a25ac3e9097fc7bfcfac6d56c/nujapepumavubiwotebebi.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/91318478006.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/lefunidarud.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/kesinowoximufat.pdfIn PDF document text
    • https://euchebnici.com/img/file/xezeresefemolinas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=side+by+side+book+2+3rd+edition+pdfPDF 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_off0000b4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 16156 bytes
SHA-256: 89b9361bc1c02ab9dcfd1b49ea19df9165a5d0be9b0f3285a830e6fe084aa665
font_02_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10996 bytes
SHA-256: 550536b7ded6b1e77eff0b0ebf473d4527deca73ea13f2d1a112b4278798da13