Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd706dffed4d8e4…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 06:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f0a01d6af68cd44d7eccf5ae125d8a5 SHA-1: 4d5ab387bc4062b7cba01a113dcec7e79d55ab6e SHA-256: 4fd706dffed4d8e4c7c4f966b4cbe855d94cd352fe94d60c47cab7a90d888ef5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious files. The presence of a 'download button' heuristic further indicates a lure to trick users into downloading potentially harmful content. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=one+tree+hill+download+torrent
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce3e5f41c---zafogajugewuwu.pdf
    • http://gocreate.termall.pl/upload/fck/file/podevitek.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1e81ea5e4351959168a6a8221692b3c/pirelupedi.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608674a8512b3---ladifepiwum.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9c1a488---kezumubufakenapazo.pdf
    • http://yuha.be/_files/file/79353470871.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a93bb5f78---jugijulugexowivuso.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/20j3gnnhgkc1puepoak5t0bm46/13227205550.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091be9ecbebb---31396381752.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/upp5h4kkj2glj8nqt24lc17vee/99345538536.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca3d96b82---59446433096.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/64d519011cac4e709905a9f76af4cea8/jelarakifexitosivifimu.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe59343c9---rosojujiterote.pdf
    • http://alliance-ltd.com/userfiles/kumajudet.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e3365fa08be156396eec0760fd2da80b/89492373225.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774fc3af782---84071920676.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4df558892---5409833984.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099819224e8b---muloropajuzuwoku.pdf
    • http://dentish.ru/ckfinder/userfiles/files/pagifagubevag.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be77059866---figoxexawulakagoliru.pdf
    • https://acronimocostanzo.com/userfiles/file/27883343582.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c5e4e38806d3103c4cbaee8d6ebdc1ed/98840304548.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9802ac56---94874237664.pdf
    • https://ahreco.com/uploads/news_file/45006069913.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24b.bin
968c778c5641f5588e36d15f1b690950a5146add2a9698f8ef6207c33b3a802a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10288 bytes
font_01_sfnt_off00010969.bin
222fca5db5feedbbd49622ce08cd587f4a61db3fecf52b3d7841ff903bb22eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 17528 bytes
font_02_sfnt_off0001377b.bin
3d5ac7d8919d0292d0feac7c8333d1a2bd48b46e1c16acec54bb6a0eb016b512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 4240 bytes
font_03_sfnt_off00014751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14751 16792 bytes

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