Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c3d75ab9b9f17e…

MALICIOUS

PDF

105.6 KB Created: 2021-09-07 14:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d4f37ddaf8032457885c1ec7acb8f97d SHA-1: ed712a2e189292be393f7d8d5c26cfbaae5b1c51 SHA-256: 45c3d75ab9b9f17ea293a69da3ecf4e65f081a98bf12d2d7a8145846c2c38f30
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised or disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple malicious links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://nomylo.ru/uplcv?utm_term=cold+maceration+extraction+method+pdf PDF link annotation
    • http://tinhdaurosa.com/Images_upload/files/6511167018.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/66285689552.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/1443087800ece7ce83e2c55b7160df60/90277393238.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/22477445fdcb2bcb1c70c5d9a00fc5cc/32563345461.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5b28fa37f63e3be6c8c3b56387b955ca/35838157769.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/6669876568.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/jiwuvatun.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612809001e807---tazogawekofatalejugexu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d327ae15c51d4330990b96e4603ef3d7/37666260059.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/worobipipudig.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0f5d1327e4c5373c2d2a6622c88ee6ba/xasenilumusaxujoz.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xoxilakuzuwesipebidira.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/91546371820.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/julitap.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f4de5d6819977cf875c044eab7d193b/9897483838.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/83389482710.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1qe4bjqvqqjnlhbbs5lsum25g1/piwosibitagiwewi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613701b3f09fd---79467399647.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/6222745588.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/53410449669.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/legajaloxowudumawigeromu.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/332781955732c0decb73aeb40011c39d/xixitoxotojanofi.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/69058941466.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///segozenodevazoba.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ae06c018---kepexovipokujal.pdfIn PDF document text
    • http://berbun.com/user_img/file/nulodulibusijutuwum.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_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 22340 bytes
SHA-256: 086c51b4324e0bfa980907722626a6466c6cf09fd1d9fd0fb9254d2582882cd6
font_01_sfnt_off0001674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674C 10852 bytes
SHA-256: b3432fed795d6eedb72f6bc489259acf5920f56c2c22196de56f5aec88e477bb
font_02_sfnt_off00018020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1