Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b4d6edc34133c8…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 02:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e558b3d5a25529717d943bc32b3238f5 SHA-1: 25eb1f2c67fbfe54e5798ab7a1026a6d61c9db95 SHA-256: a7b4d6edc34133c8fdaa288b07a4b3ab0fbcaf535029b7398093dd7857e532db
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware distribution. It contains a high density of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://migger.dk/userimages/file/77691626926.pdf In PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/xowajorilijazesodopaz.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/lakemafasowapixepovelo.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/deraladapowesukakidu.pdfIn PDF document text
    • http://webs123.com/userfiles/file/63875035286.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/majumamumunijijaromiwalo.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/47051853191.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea0435b61---gowokenad.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/84227419247.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/xususef.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/87730600697.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/leterawajejetevabatu.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90493254504.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c784c3d2ec---220228248.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210915_160925.pdfIn PDF document text
    • http://vladekoservis.ru/files/dunukedexefawaxifaban.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/31553459840.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210916031419.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/62156137855.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/zuvopunefufeji.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/12557123794.pdfIn PDF document text
    • http://qdjshg.com/files/file/79444308330.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109130648196570.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/dipegut.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3f4b65571141415f6d564bd0daca3073/57998777778.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/gabujezujolekikonebujeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=watch+movies+online+free+download+free+movie+fullPDF 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_off0000b4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 10988 bytes
SHA-256: 0e46411104bca6a85fa3d013c5d7ca8b1ea5393cd6fbd29bf8554dc8274b0133
font_02_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 14384 bytes
SHA-256: 87986c5f147cf3c881bcb5fa5ecc7bf5e05293229e9937965bda32ddc72a606f

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