Malicious PDF — malware analysis report

Static analysis result for SHA-256 b076eb2cc55c6310…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 12:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e389c129dc4e967a44973da12166bb7 SHA-1: c40800b83e4cae81fc1ed8155252c72b553efe69 SHA-256: b076eb2cc55c63100c5661c7a03d7bca461839ce5d10a53de151bc6c12de3baf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7f7ddcc29eec03e66c9b8af67a1ca1a1/fidagalirunijota.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f3c6b58bc---bozagobono.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/sefupigawiwipunuxonuponur.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a76718c3139a06d14260d998c8a0e575/bivutebadinofaputodifipa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d07a91e90ffdc3ee6f0a01cce94638e0/geluf.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5554f3265---36861313131.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a5669669e4dc747b7c8b329899b02b59/36172839055.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb6707f70---kefowat.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/wavafo.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/89697448692.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/gabawilus.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/l1r4h59q3tj57g6h04alqqecm7/25627327237.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbccf5f0bd---daliluwitijir.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/06743ab2cb545505e750eed9f6893723/29433909471.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/fixosezexuvidenakedaviko.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/84f4ded858b2cce9b22129f364baf35b/rasezuwitesoxiluxatozakot.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d9c553b98b160b381c761d8a743e5ce4/gapobozejunigi.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/35923630593.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d1a52ed2---zesitubuxit.pdfIn PDF document text
    • https://atrax.hr/files/17723332185.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zavozukenokigida.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed3624428---sobanesedexafi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5dbcofnnlholdlblco4f8103bc/39413661767.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d834b43790---10103884537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=play+harry+potter+and+the+philosopher%27s+stone+pc+game+online+freePDF 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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 17124 bytes
SHA-256: bef81685cbbeeb28bd87e2347052a50186ad480851ae3d5d61d121d8c140fa0f
font_01_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 11216 bytes
SHA-256: 44bf117d31807798ec971f487d53c754fcdc725b69b3df731a85b91ec859c527

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