Malicious PDF — malware analysis report

Static analysis result for SHA-256 313efb776d8c185f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 12:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 686a8d75be6e90ca862d0cea542c5311 SHA-1: ef41b85c36cbedbdc9dfbaa75345ea7ba647f981 SHA-256: 313efb776d8c185f805ee2901d594904451b73ce01fcde24aa93c86489fee1b5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains. This structure is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/89562419453.pdf In PDF document text
    • https://senhewood.com/d/files/16112977722.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/joxidemo.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/wejejotumud.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/gunamexewilopu.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/xekogavubobibe.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/69010473491.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f759346b60a---pepevupupaxipegez.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/difibefuta.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb724f1deb---zafugopoxagedazudexokepu.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vizixefoxugoxuva.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210621141752_9w18pw.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/netilugobuvinisopuro.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/da29e3fd7d5cf6729295ace829faa8fa/24557618957.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/76881967089.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/581309005.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/49186790243.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d1ef3648b7748ae53c2045b1ce7a2219/84119755324.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/lufatonumo.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/genotodola.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/86228341074.pdfIn PDF document text
    • https://x-software.cz/data/file/51342185456.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/23939620224.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/lifowad.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/pejavalefituparo.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/87485641721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=srdp+deutsch+textsorten+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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10696 bytes
SHA-256: 6a91c2af7e80799204fad921fb968283e3dd4b0ce8cfdf7607e6531525cec076
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 19528 bytes
SHA-256: 96884441e98cd2702cf41e4d44c16c983abbcb95331a87f5b207719c0255a3e1