Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5daebcbf392b942…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 20:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b8b9c7b4ddcdbabbc6fac76be56a1770 SHA-1: 798a84479e01697b74e0b38bf8a0cedd547dd363 SHA-256: e5daebcbf392b9425ca5ea31ec42a7d3a31e8076b0f58f3b3ca564798514ac2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f4b0fa61de5b009ab3e0ae2fae3d962/8749774452.pdf In PDF document text
    • http://lezeckastenakosice.sk/upload/files/38930162443.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d493930d7---zuramiwubafedalani.pdfIn PDF document text
    • http://954move.com/clients/4890/File/54247515638.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f0729e3dce3a4e48c047119973d58289/rotalujodotesezuzuxi.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6d291dd14ea939c502c4584f27605532/17198484513.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210623081906.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/tj6sbmb4kphhjimoqt8s5p17ca/54888471837.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c64c77420---52428936092.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6ab48c07---tariwilafepuxetitonim.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9ghsn4vcdv4mqcr7a7ncpu348n/zutolosenavilerenok.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/1943381530.pdfIn PDF document text
    • http://change-sexy.com/files/files/18038753545.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2138017c4b1bf63610190bf3bd51af61/joduwubekevez.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/75312290110.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/79205060402.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5a625b29a---retexokobiwuduraj.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/7095489927.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8709f0c6aa06ddc7a06af0b5576e1ded/gabusunovetimolimozosizi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736d9be0dab---53003717837.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/08dfddc8864e1100d68dc5bcac05064a/nowigubimaligizagorekezu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/l5kcnqa6jrhaj451pgccdd943c/gotoxalem.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411cdee422---76760444557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=build+confidence+meaningPDF 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_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 22768 bytes
SHA-256: 7323e2f69cca81f427a0796a55560f9d6f694536e84095a8eecb5080d56c0d2a
font_01_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 10604 bytes
SHA-256: dc8306ca74e80ff73566a8c5c3ad991aa4aa3dd9b96a807352c74e04d2642f25
font_02_sfnt_off00013898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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