Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a6e2f6e801cbdc…

MALICIOUS

PDF

74.3 KB Created: 2021-08-29 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4219ff610bdd04a8eb71867f57bf976 SHA-1: 7edd062f6a76264f77d8a1d6a3b87b467864da9b SHA-256: 28a6e2f6e801cbdc5490279ff528b70bef894bff13ae169213c93fea2c17b493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malicious content delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress installations and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the presence of multiple external URIs and the link farm structure suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ts22ovi0rkc7jgsj7drn4sktsk/99208393033.pdf In PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f4bf013c895d7249633ff00aeea80fcb/71741552306.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9c599ac75310c5cd62a2c721ca87e87/91687767613.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/66735299353.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec0788a901a3b8133d4785cf940a5135/rajagisavazelutiguz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c661604c2---rexapabigowal.pdfIn PDF document text
    • http://planetamama.ru/files/file/somofutenuw.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/44883148058.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7463e008a---63285440156.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/legono.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/44271016073.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/vofumosavobug.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940780de583---tokoni.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/4344737460.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/ziwusosabafizifun.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5ecc67e5de60ac630b49e9cade04fd5c/45600728069.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/17722462816.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd5328f1c---37201932015.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/lekiz.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/8431426705.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de18543a5a6---10719765516.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/023c4691176451017c9e76da5ef7aed0/seviledojexekarimojizaxe.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/bivejinozabuni.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d741003d3---10049925715.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1a574468008c6004726a34e370d7c18b/30356186409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=26+ft+flatbed+truckPDF 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_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 16864 bytes
SHA-256: e26446d378d353819c5b832028bc2f23e7e3e0b3232f9d757f9579ae9d4a28b7
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 10508 bytes
SHA-256: 6b4edeeedaede2a1e1e25d96f7e3554e41a10654ec421f1f3e1f45fa91ba97e8
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1