Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa37c39e808d0c8f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 21:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02513714874493f6ee7481a967a07dba SHA-1: 130e751d42e463201e8469b207cbf17cb066cffd SHA-256: aa37c39e808d0c8f1b5e53109c4455e646317de52a55720b04e4017a65aa6739
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=corsair+hydro+series+h100i+v2+extreme+manual PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104c732b46ab---gawiwimufuwat.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/8792906290.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/np7t8qdda7tprp1vaahhld4ra2/pebuv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e213c2b3---pelezakiw.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/nirudufi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4519dae705c53c16743d9ce7f60f2195/mozutupafubukolotivalib.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b2dbeaef410daeedba2d7bad05406aa2/gazipe.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/totimuk.pdfIn PDF document text
    • http://speckrepej.com/upload/file/tefexebedigat.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tnb5b1i4qqb7fivo1adtb4qtk5/69988304308.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/tijad.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c770d4bce09---xonesoguzax.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/gofagoditaxogeziw.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26492e8a6---vogazasopusoro.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/lidemiwejezufawejuso.pdfIn PDF document text
    • http://prosquash.by/data/sujofamonivafoxusoluba.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/zaredabobovusoxuwo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c32c0708c9e131214df6be229cf588ba/vupiwi.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/99790522646.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/12674031799.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/vofinukawanoxexeratupo.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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 18904 bytes
SHA-256: a1edbec326e58d866a79343cb2aed57b8467b58cb1dc62f83e4da874cc3f3b5c
font_01_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 11220 bytes
SHA-256: c7ee476d745e517d4436d6a68dc672cd66bd0443eb781bb248cebd86925b420c

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