Malicious PDF — malware analysis report

Static analysis result for SHA-256 d692ad6cbbd5a585…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 17:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a9b5fd6735fa050dd3234eb200af660 SHA-1: 05607c7ac14100bcb8c40abe4dd525cb89e953f6 SHA-256: d692ad6cbbd5a585ac63fe0f803b10e70aaff82d741e84106febe09a699ed023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users through multiple compromised domains and disposable hosting sites. The presence of numerous unknown-reputation URLs suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=attack+on+titan+gloud+games PDF link annotation
    • http://remobudostol.pl/pliki/nodedodezoronululudeti.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/tivepal.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gimubemidanugazilu.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/76483685891.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/gizufemototuf.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/kujuzekit.pdfIn PDF document text
    • http://ranch.pl/files/file/37147774890.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210911195710591085x9ovy.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/76025678e4545edc45f24c69b4c63572/90267083963.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/47785668981.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/16200699937.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bad13a8bb9e0c1351818e85fc1b7c3d4/ruxoxujotusefu.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/91908554338.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/soxofafilenis.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/boxojevixuvenutema.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb23e78620---kijeragotolamo.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/nulolejixanapetijikuvu.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/nibawasoxerajonip.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/geronulofadinogefa.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jabadosiv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3a344a77---85846530265.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_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 17016 bytes
SHA-256: dfd25d03e65958392e9a28e117939c22be23de6c2b381c2f76ac47fdc8ab4529
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 10784 bytes
SHA-256: 050556398e0a8c02a335867e5ac520cb92aafbae9a1e1c8b3fc264c29804cadf