Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b37a36b5f3ec8d…

MALICIOUS

PDF

72.6 KB Created: 2021-05-14 11:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b3d7febbc09e7eeb22865658b5170f SHA-1: 5138838415cc722a4919c4e54115a142c4f2baf5 SHA-256: 63b37a36b5f3ec8d051ab6e62ab3cf7569504f580335f7d94b3fe1115c7d23bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to compromised websites, many of which appear to be part of a link farm designed to improve search engine rankings. The document's content, presented as 'Asisa madrid cuadro medico pdf', suggests a lure for users searching for medical information, likely to redirect them to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=asisa+madrid+cuadro+medico+pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800f2f2e54---kixal.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a26da2bea3e8d905b727c79ad4d7b5d3/bamavavarujuwedejeg.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/rbrdqlh3of5dlkgavrukhpbg06/ribibetofaxoxo.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/tuzitiwina.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f104d0e55b---14337422001.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607818ebba43b---bajolotulofalebafu.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609104401a12b---7045926363.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe8cc57a0---fikupifejekukap.pdf
    • https://actor-conseil.com/files/file/kejovudugukidefosutesu.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fa5c2ebde98ad190cf5ae62d27301f78/29803616449.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160850de40c914---wozuwenukoxedukewimuguf.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f438c79c1d---58834099539.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e7150993---31437961078.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/pofovomifutetal.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/483eaa39b26e8fd27640bd4dcb7daab8/17718183648.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dd1e0d241---jejisivogodimuvogal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa7.bin
2d9019ae239cfbad81edaa4980b845c4424029928f1d3eb68299981cb79aeb8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 4952 bytes
font_01_sfnt_off0000e071.bin
4829f45215ba53faa3578e1748f5a0cf8fce81c8ebd4d4947a4e6e88a0678067
pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 11580 bytes
font_02_sfnt_off00010602.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 4324 bytes