Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece99701d0473e11…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 20:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 75e2608538c46affc03369d28faee242 SHA-1: 5a97ea55de2ed4ba77525c3f27c694e72edcc5cc SHA-256: ece99701d0473e118dd5f3426218b92ce220eede41d8d2f46c04fd9ba06f1a63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF's structure and embedded links suggest it is used to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://studioguatta.it/userfiles/files/13130635673.pdf In PDF document text
    • http://andlupa.com/userfiles/file/98292025915.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a764ff2c---45799828442.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/70932614172.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8535809e26---32533528219.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/31438836099.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c26c095f---56968313452.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/repokewiribu.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/19755279048.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/17de72afc32c604e2fc11e7b22a4f0c4/xobusopepuzimonifusolude.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32495160a---75577877012.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f4e173089b247c0663c088e0c44e1ac0/31237131917.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/rarabefupenusu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ff1db77c6495fec04933c717ea1b3c3/gotifipesafibumuxoniladef.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/12552ecf20be78283f38319422db8229/91530234581.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/aef2541cb5fa9200a8455365c40420b4/fabobovepebitunema.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210611103323_7577zh.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/junamakatavipa.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1191dca06db78b9b04dd3dde52257aa7/femarowovabenarip.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/84v28i9ojlaluraa2bft7ka1p6/95798687842.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74329be10---vapetovulapagepam.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/pepodigexifolozebup.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/vepividiv.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/bazomajikimavu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608486eac853d---36457290515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=polio+is+caused+byPDF 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_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16900 bytes
SHA-256: 416f8cd448f7e6eb0c00adfc2eb36a2ba31cfa70e3a5fc5eaeb205fefc7e851a
font_01_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 10416 bytes
SHA-256: cde69b4a32abaa400a478596576d98e994f7b4e1554af460158178002080e424
font_02_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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