Malicious PDF — malware analysis report

Static analysis result for SHA-256 756c0d82faea2cdb…

MALICIOUS

PDF

163.1 KB Created: 2021-06-28 19:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4535dec0881e9921d9e6e3617e0d72f2 SHA-1: 2765fd4ba08ca7934b4995a9339e3bc1883e885f SHA-256: 756c0d82faea2cdb6916125fd95fc939896bcf7b4ee8a3d2b8374c2bd2b58f50
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/73f5f5cc6b7b60617dcb7e0c3418fddd/40563598377.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608507d6cbab4---jozavi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7210d1c513e9361d03d63bfb14ceb549/wanonidibomabesolowejusup.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56af76a77b---sajogosaxetimerub.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnrhrg81i39au04kl2gpeh60ke/bowijolubusa.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/66752239445.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uttrbbvett9uk8k45o1ohqekqp/58329135046.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/15534636641.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4e31cff2---94588913442.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/mokojimorewer.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0bb35bb75529274d8240c8a9c44bb296/16842582786.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/wafepewe.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/lkfp8tvpfblg28nha7hu8igg0p/2110685752.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098be4469892---53419425250.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b678c953ae---nujudufigito.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/woluxawo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc4777aaa---24359565590.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64966646633.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/60lagf38f3lanmgk4jelu42ti1/guxojukejirevud.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/rezasusiwofagemelu.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/sugevez.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tunavasotaw.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81284681272.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/81d1f4809dc69b08951634febff06035/vanetonojozujubuvin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mechanical+vibrations+kelly+solutions+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA2A 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_01_sfnt_off00020fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FC2 21320 bytes
SHA-256: 4014082cfa1a018e161a8d9fe8e6ec903435562cbfcb2a18fb250e9b811046a7
font_02_sfnt_off00024a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A63 11000 bytes
SHA-256: 85845bb1b7663905363def5e9a392bc8f06b274a074b9d3b6a656c74f4ba637e
font_03_sfnt_off000263d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x263D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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