Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50af85b61947060…

MALICIOUS

PDF

91.1 KB Created: 2021-07-18 23:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa15e63a5172233f35e716d9ac4809e9 SHA-1: 82b039694572ff764a8b30a1d89664d53498f83d SHA-256: d50af85b61947060132831cb89165c329e5f29d2a7086eeda904843130dcc863
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress upload directories, indicating a phishing or redirection attempt. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vannordenvastgoed.nl/userfiles/file/43922317763.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d022e44b87---loropoguroxiwi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0995b97e46---33099244592.pdfIn PDF document text
    • http://feg.vn/uploads/files/84914914091.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae76d1001c0---xalazojax.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/70846430884.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xokejopulob.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xofokom.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0fafd9524---jafofadetavew.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c279b8c2c10---15136856830.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f9345443---83070380055.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ad5c412d0f06ea5aa524dfcf006535bf/dokefewagugawisa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b15a6546eac---95139118884.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/dowotikivezozaxofafonak.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/perexusawavejedu.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/vejunozoleka.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/tuwoxexilu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/besotejimurasidofodojuri.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bdq6729opukmtbc35sin1f3ab5/fufujovobubewiz.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a6077667fe66d62fd394623fe1d09994/larozokeleja.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/dajamaweganifufekafapupo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/16437745802.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd26e7b49---nudokijufisawibonusibiro.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/62421006344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=simple+living+with+kidsPDF 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_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11885 18040 bytes
SHA-256: c4a0364507ed13554dbe5161e623ab012611a18a414f3389ae498178767de6c0
font_02_sfnt_off00014720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14720 10776 bytes
SHA-256: 772fe6bc1f8f081d34c8453106d3b7d7f6afaf9ffb8cf20be8811f47b24ad7cc