Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7a8a72c420f2c3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 09:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b4ef1f28420a85ac8a067cab0acb1cfa SHA-1: 9263451e8ec34326ce1f0257858e89fe09cb808b SHA-256: aa7a8a72c420f2c37761e590b7cd01e4f5fe6ffe3978f221815c0c687dc498f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites or phishing pages. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=block+ads+app+android PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cee8c26f680be7e86bc879701596f7a6/60340178831.pdfIn PDF document text
    • http://fruitvita.com/files/files/kexamubokimiwugovadi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b7fe8eb28---76899359903.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f5d2a25eac2c8a3526059a7e2466a713/gumefebunexetatenigisar.pdfIn PDF document text
    • http://szpk.hu/_user/file/vasonod.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/budadenuvinawefetipur.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/23711993897.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/476a3452f156c9f91489b050941fbe67/33617114320.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/midagujoxo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ab32fd2af28946e66fe1c81225bc5248/ragilojejiwifarozamagipom.pdfIn PDF document text
    • https://filetorme.com/upload/files/fojubuwamotitulive.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8cd17f0c0019442e5290ad63ee9014df/97990677804.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100510502278.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/luposij.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/zipuditebojedunolasefoja.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/vuzufutibupovogivujire.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/17219293465.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d93ec4be32---zowexebalakadesitisiji.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109171035593569.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/zasiwonududotexoxazuto.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/27077319079.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148b5979a768---puxaruseloxorivakebos.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/goxeluvef.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_off0000b244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 10424 bytes
SHA-256: 2945304c04ffc07d0b6b46dea0ab85e9e358c9d665f8e3f1953fc407891caa7f
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16768 bytes
SHA-256: cc5c872bdcba621f4d153a593ef4c180cdacd2a4af4dc0cf54d06b20ea5435ea
font_02_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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