Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f8be33132b868b…

MALICIOUS

PDF

137.8 KB Created: 2021-07-22 06:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed818fab2fb402d2d7de18ab452d417e SHA-1: 13cb86b210fd89a1e9e9076a784f89942dcdcc1e SHA-256: 35f8be33132b868bf0e2d50919eacea9e0b3fd3c495e73cf9e376317060b9396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tj6eln2q6bmqcga84jdde6gh8g/75505006144.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6aec3a29ad12080420819922493fb353/bopupedobikuxofugujawowan.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607348ca8bc5c---zobafusonetivubiminexez.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/f9p6cerkp6fkaoln9nte8nqf3s/buwuzavopatalo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160775a58577a7---raxadasokevuwejaxexugum.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vifozozinejamawaveresalaf.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad500ea5b0a---94281079391.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914dd39ab50---31334327492.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/7236863947.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/mitovegopakoz.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tomokopun.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/vidasudolofide.pdfIn PDF document text
    • https://blokhol.com/upload/files/zureluveveravebewa.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/11402350800.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/lepotupesejit.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160879875ba261---kemomufuronokifanax.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b7a74ebe---60422479461.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210612093456393.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/lujaxiwutafex.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/zawokavakuwifenegewop.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee6c297ff---visesobagebilofazolu.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/libugezimuvez.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/96449593840.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/84335291372.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/44c17f0b9df9989885a5027f27b18a87/sagev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=casey%27s+general+storePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19814 8024 bytes
SHA-256: f0b459c377bb946105df031a5883dde990387819150ee1f47558431b1119b5d2
font_01_sfnt_off0001b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B400 10372 bytes
SHA-256: 1cbf4eac0dc9e77a6df48edf10406ce617323ceef4b5cc4e5df767338da8a0de
font_02_sfnt_off0001cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3CA 20204 bytes
SHA-256: f6933f483ddc685613665df31223cdf023c6ec9368eab2278093a6e245490712