Malicious PDF — malware analysis report

Static analysis result for SHA-256 447556f9d56f5bf5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 00:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d80557c4b3c422c60c7076a0e7e765b SHA-1: a2d7e9565ab69c47b586ff8ac96a1797af1b6044 SHA-256: 447556f9d56f5bf5c59d34db51228dab9c04b16f78a2dd1ac008160b61ca6c0c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/n7k2b0g5evn16pps4f7l8fqa4k/27898333642.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b68289cc894---19173696298.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/nofilejosanupamit.pdfIn PDF document text
    • http://whatdwellswithin.com/file/94338622121.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052510332273499.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/feapaet741lkj38t94him0n6o4/gopawoza.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52a25812---nebuzabojitavalonibiribo.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wonoxiganijupusodasu.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2e39fddd9ebd5e25d3aeeb506e7d993d/62765695786.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rojido.pdfIn PDF document text
    • http://paliukenas.lt/i/File/29755931377.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d2cd6795---33270851523.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/57825851007.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/frg9vpbjgiqej74tun49ptnmvi/fuwimamasirezawewowamuse.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90c8cbd47---xanulaledotokereveduzuxaz.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/vinaka.pdfIn PDF document text
    • http://eventechsite.com/files/files/60720105938.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/gopulozoxusokixiju.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb87c15b5b---82141938798.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c051c8ec4---xumipef.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/28444037743.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/32713117452.pdfIn PDF document text
    • https://isosklo.cz./uploads/lowolari.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c88d96c65---65514764894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=report+writing+format+example+pdfPDF 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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 16856 bytes
SHA-256: 1ea77fb6c3d7d43c293a0a4b536f36c18ce111627116d17e22ba3ef5e797c8cc
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 10908 bytes
SHA-256: 8984511bbf46ee5a849637458ed1825b64910eba133980e41e21deb81fcd2e12
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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