Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4146c45042ea1a3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 18:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 00b2ad1277f2bd13134bd10fcfd16957 SHA-1: 4faa23dd05012134401b8212fb2801740e7674a8 SHA-256: a4146c45042ea1a30981abb71f366fa1e4f30e47db518bfbd127a85ef645689b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=how+to+export+a+onenote+page+to+pdf PDF link annotation
    • http://chipublichouse.com/ckfinder/userfiles/files/purojovipusatixoboselok.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/62389557778.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kofozejolab.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/18538529201.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/12530145375.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/92481757044.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/99194440950.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/lokasudapodigamiwojeke.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934a2e1e4d---wejovamalafaxok.pdfIn PDF document text
    • http://cobmedia.hu/include/44914311965.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613034a40a7b1---gasuriwiwaridibovoz.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/23027283827.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nesuzorofowapedoze.pdfIn PDF document text
    • http://zaiger.ru/img/file/2956650499.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wuzod.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/60582686073.pdfIn PDF document text
    • https://esz.jp/img/editor/files/61394624112.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lenesedigevolegupar.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/62515951342.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/50428317457.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/327551345.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/576dc9c8672eccd1958f52305a836aa5/zofolepadok.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vodiluxomorasewog.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/ruguvidajinozujudobuko.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/buwapowokavo.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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 18144 bytes
SHA-256: 6ab65218c8d4838c77a3c6cfbff83a05ec6938d897f9549489ad42038f61070a
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10544 bytes
SHA-256: 3591d38b77ae0a8d8af3defd7b9cf27da108147ce29af82b552ce414de94e178

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