Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5527fb0046866da…

MALICIOUS

PDF

97.4 KB Created: 2021-06-29 00:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f31a3bd892443191b1b1c93f2325d67 SHA-1: dc0cfdb5fd06503aa9ba0bea2e78b2560a00c07b SHA-256: c5527fb0046866daf679f155647febd2b052788f016ef71a257eedd84a35195b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. The embedded URLs suggest an attempt to manipulate search engine results or direct users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://illinoislivestock.org/userfiles/file/77010744491.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8jlhka9fvhgd73ouua8r0cedqu/26937266949.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8ec6f8b2---gowaxeropin.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/pupujanekidot.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1cabd043---83842259623.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6e96ec26ed4dcfa2ced839b0ada598aa/kasekoderovefarepapix.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/dowamilabafovarigo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e2d03f62b98bfd805b64d399357c9645/52969037372.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/56bcf60517520dae949fa34084717f18/39635936822.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079b94d4f5b6---nowapopifokizigumiro.pdfIn PDF document text
    • http://peak-experience-japan.com/68321932323.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7e63b032---43053678130.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a726336171---33276927918.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa8c1174f---52582657603.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ccfcec88106941344b79b4b8b58c01d9/49271927050.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/t6f6l5tpd5m5e73nft2dvesqoq/rudiloxifozubenam.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/691947a38867ab5613bb54aa808ab14a/62016369303.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0ffcad6aaeb9f51d12dca10fe833b125/rafiforadaleva.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/v0fvo83oio7nf8nn825bp6lon1/9480457395.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/39edd9acaf410092e2e2d98578940858/2597432118.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/q4i0gk66s61633vn8vde8viokf/judulizuse.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/3789468721.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/68076090702.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/32631053357.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6791239377045c9be1e05880134a5882/baruvutomed.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/47921750891.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef38769b1d---10385816705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+give+yourself+command+blocks+in+minecraftPDF 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_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 18708 bytes
SHA-256: be14de2c159fc5e497fe9bdbf49679e875a04166d9eed12296f9a8bf40d338de
font_02_sfnt_off00015d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D19 11408 bytes
SHA-256: a2a5628d5b4c00d9e7e0712e196ec3c139160c32378788e2e4c0491a1322e076

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