Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfab6070d847ffc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 03:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 664357e9b6c6a3f7b3d5841e6fc74e27 SHA-1: 32109e65454145099dd7a2b52428e8fae5db8d31 SHA-256: cbfab6070d847ffc698cf92a8f9b3644b01eb7f760191776b24455e8ce5e3164
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads and disposable domains. The embedded URLs are likely used to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=tv+guide+for+montgomery+alabama PDF link annotation
    • http://realestatespoznan.com/uploads/xexiwonufajik.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/nosinitote.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/91855612601.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/15463730172.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wusubabewavisafulonexe.pdfIn PDF document text
    • https://masukpt1.com/contents//files/masuguxoterodojuvura.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1gph8f2dod37kup0l6gmn6aab2/xoperofa.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/53629823588.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/43813225676.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-7/20210707025020580742.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ae9b0136f4856d0bd674d92f92c23a41/zegaxowodexejolixutin.pdfIn PDF document text
    • http://cichanski.com/Upload/file/78622722859.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/netimoj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8qourf0m7decm3n44od0sofahh/xusibojotekebubewofejitex.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/93861226157.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ropilos.pdfIn PDF document text
    • http://capri.lt/userfiles/files/72190965047.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/73138117518.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/079a5f71656519902508b83214250b15/42700815918.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/91265154779.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b671a04b---70217739969.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052116571837.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/benibuxixatoverazu.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/mamag.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/32326142940.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_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 10912 bytes
SHA-256: 990b139b45c6b7f46de108ae7d859ff2b5f729288bace2a40f87ee306d5aa34f
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 18892 bytes
SHA-256: 5a4e3f29190054d60ab30b29dba707de09b4d28349380b9c99e3e8005fee3cda
font_02_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1