Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d11a2336e3cc565…

MALICIOUS

PDF

83.9 KB Created: 2021-08-30 18:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3be2ef337161af319f15c73b52c8cc0 SHA-1: edd221eff5e253254ebdd58527c2b8196f375a9e SHA-256: 2d11a2336e3cc565ca46c5852fd741cb410874ffa4dc87775c7826a54aa0dfef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple compromised hosts and a link farm structure suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lesfeesdelhetre.fr/upload/files/bopumaxusodigebizudigik.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160772e0e7af1b---nubusonafe.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/73303975875.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/falosejunokonux.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/34695210732.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/paxazaj.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kebaxo.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/2483546941.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/78392565890.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7870c27ff---35563658487.pdfIn PDF document text
    • http://inncredel.com/uploads/27508655605.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/90858636475.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/26128491633.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c05fd4c7dd8701004de81774155fc5b1/1995877239.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/megisikepevagolike.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/26543969090.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608100cd53703---botinevonefumonaviziz.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tavabiramoredarokaju.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210812060545950349.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/48963932547.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5fc7e890---zirofijilit.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/14812711286.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/nipogebipagosonawegujur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=end+of+watch+moviePDF 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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 10564 bytes
SHA-256: 7f7f56863727430b3135f5d9df5b12ab4f1d4e723b806567b50a08414146ab2c
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 17316 bytes
SHA-256: 3d16ed29e38e9d0906bbda0a193ab878d3ecb7a9a56808183498f91282759114

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