Malicious PDF — malware analysis report

Static analysis result for SHA-256 5008693898b77709…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 17:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f98d51a69c74b1b433eb7ef5edc16f3b SHA-1: cc296ade8205167efafcf7d5d4810652f13c48f7 SHA-256: 5008693898b77709672e810959beb7e2c0d8936230cb929ebf29cd142bf89bcc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://buyyoutubesubscribers.com/ci/userfiles/files/vurepelifepukogareju.pdf In PDF document text
    • http://vitanova-cattery.com/upload/file/51987450896.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/wejupawokedegisigexokawan.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c952a92d900---30458207104.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tixijonet.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1a31a4c78f8cc2e35d0fc3f1a48241fa/39673535307.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///77930477696.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc1f80cb8---88151333963.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/56284658772.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tb45kcubd4sjva7bnoedhigp82/44299072772.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/vojawaxivefuwavomabidid.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/nobetase.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xopeparel.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607779683d31e---jufaxemijejimewatiradagi.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/22865769568.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/gobugo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/mexodomigenuk.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/21767642964.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109031253188345.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/memotu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/00b953fb6e926da46d10ebdae465618f/sinolox.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/027bfff1fcb6167e4398830d053c0fd7/65908419034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=whistler+ski+trail+map+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_off0000b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB564 15572 bytes
SHA-256: 53bedb4028837bf8c38192f9f2193d9424839971de9290daa15de17b9122b4d7
font_01_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 10624 bytes
SHA-256: b7be574d4f9b995a1150c7415600cf63af4af3425ca529e6d33ab59331ab45dd
font_02_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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