Malicious PDF — malware analysis report

Static analysis result for SHA-256 864ae6d80a572f9c…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 15:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0d61b81cc1b8b205f3dbdc239aa3906 SHA-1: 665845676ed2249fee125998c71674869133ca46 SHA-256: 864ae6d80a572f9cf16370008d7b49846ab9eb7c90a168561daca7c9dc568f79
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be redirecting users to potentially harmful content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82c8a0e02---97133115025.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab747e4780---38035150353.pdf
    • https://gikguamerica.com/userfiles/file/keninapanagutojubolirixe.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/voromidapafozoradokinu.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/fe6882373f667b4014159c2835b4d68b/murixodaxubo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a089dd93905---43733468436.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c00666602---45851869202.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9887a536a2---sojiz.pdf
    • http://hzjksj.com/images/upload/File/48979513980.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1b0601dd86edc48b6784a6605955549d/janigireluso.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16090e59220a4e---rexatedujilulexiwasuwajak.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c462f7ccc83---bowometorolomovawememu.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909e6645495---21904529069.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fe3789c65461a23c458c567f58dd8c90/durijo.pdf
    • http://taitung-house.com/CKEdit/upload/files/46053040972.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b1b3d616---sugalejafarega.pdf
    • https://etimes.mn/uploads/files/58273064672.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160824dc472405---32813623499.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/03rdboav06sfvv335pm879q9vg/68356984522.pdf
    • http://hanarotalk.com/userfiles/file///zaguparufikopi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7404269aea1ab88070957ddbdbd3564/32258981290.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece83c74ac---31944289228.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1460138p85kcis6dauko720320/49267232435.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m8a2c9eo3u98tsmukhko69koc4/42961611887.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/j11ont4084i4isg0r8q6720ohs/mululalumezekonilobovowu.pdf
    • http://vantaibactrungnam.vn/upload/files/93745572257.pdf
    • http://anipetkingdom.com/webroot/img/files/60738623511.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cession+agreement+word+format
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55c.bin
fbe5eeb5c6515af77b0e33c3f6e71e54c1b599986c3649f679b009b0a7d13274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 17356 bytes
font_01_sfnt_off00011273.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 16792 bytes
font_02_sfnt_off00012a8a.bin
e731bdf7bc4594b20b940ec9432166649589dc042fae786560f331afa61b1582		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 10768 bytes

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