Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4aafc8eb117bcc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 17:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee61262665c4666843aa331d1ef8071b SHA-1: 70c5cd12d52305149b1fe214c442f9dc86bddb10 SHA-256: 1a4aafc8eb117bcc48a3e817c4a9f972a9a94b73aca0ad26d40ce28d234e1770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://space-edge.com/upload/files/kofuvidagaruxafeli.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/xuwip.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/99825114937.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/wirunamofevibob.pdf
    • http://ristoranteibucanieri.it/userfiles/files/gujaxusuwud.pdf
    • http://dienlanhhuubinh.com/upload/files/64504808325.pdf
    • https://indicaperu.com/userfiles/file/fijofajazazilorokarozonoz.pdf
    • https://studioconcept-stand.com/fck_userfiles/file/34433136718.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e4f7db85---jalanarevesigi.pdf
    • http://pedraferro.com/files/files/67239898450.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b243c1b00b4a3cab9cb454b5015a15fd/duzolebuloworotinis.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2f0f379a---96900283124.pdf
    • http://avalon-essenzen.at/userfiles/file/84638454389.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_080134.pdf
    • http://eko-gospodarstwo.eu/files/file/mozobiludikuletibuv.pdf
    • https://cahayaapi1.com/contents/files/kilevajigin.pdf
    • https://borgopitti.it/userfiles/file/ramitugifedolu.pdf
    • https://angkortaxiservice.com/userfiles/file/4747507977.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/28699735433.pdf
    • https://consultemergingmarkets.cubsindia.com/files/tivijovif.pdf
    • http://namjapizza.com/app/webroot/files/36570143544.pdf
    • http://swotaweb.com/img/upload/file/81947604363.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e53pbcsfu3715q3dtqdrp1kmk1/mojawuwovak.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/tapusurogutupepijovekiba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+winter+house+ideas
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf1.bin
329cfeafe957fc9115ec93150677cce463f5cfd79894ee9cde79048791e1695c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 17584 bytes
font_01_sfnt_off000108e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 16792 bytes
font_02_sfnt_off000120f7.bin
38975921733e361587ae00107c28d06cbfa5812c6666701de4c7b81cc314adaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 10704 bytes