Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b30db7f35e52af…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 12:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb55d47522f34f3f30aef5aac521f99e SHA-1: 07469b73d6db5b72f7f6a9eb97310f81b5283a23 SHA-256: 22b30db7f35e52aff3950c46982bd8f531b459c229f592d6202a83814740f4fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination and distribute the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613509748ee92---zivofo.pdf In PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/101898006.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/95557244259.pdfIn PDF document text
    • https://tivicom.vn/upload/files/xedulixugudatibetup.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376fc0c98ce---tuwep.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/tuzanowevoledizuredu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/64952636893.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/mexasimajulanezekinobi.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_044638.pdfIn PDF document text
    • http://christopherdallo.com/file/kubamebameb.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/45749473841.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/gagoxetog.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/52024991236.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/bonuxemenabulewibakejup.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/rogikuwobawixodurutadisa.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/gulixajemol.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17412988675.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/18295386232.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210904021212.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3100258c0cd9057fbfd675f1b122b803/zubos.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/62712074969.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_08_00_31_7894.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be788d0c3f---92306451764.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/82541490743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2+main+division+of+peripheral+nervous+systemPDF 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_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 15888 bytes
SHA-256: 718ecd6147723d679ed5024c2b45a3c56b4c84fcf561527c9b6e25a30433fb29
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 11068 bytes
SHA-256: c2276b6c84a33d2cb12f1b6a9e85bd5f93fe486e37c12fc293dda6a26eaae34c
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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