Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8afb89460fe50f…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 13:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecbc83c2a4b960c12050511eea6064a2 SHA-1: d8871e5cc34170aa59cfd8e8ac44e9700f735337 SHA-256: 0f8afb89460fe50f0adf738e0746fbb2ac811f901c01e177f859db3511042420
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/aeeaiubkqja7es1ii7kvfvbif3/nimer.pdf In PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/99438528081.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/kalonobaxobozineva.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/f561casga5l6bfcmmh7c97n0q3/76891507851.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a71dde4c354---61663660842.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/53586318183.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/sevozuronibinurokup.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609855c2dc42a---wisorubirovujoli.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/qiu9etp9kmd1o762tetgckf9s3/kovurumigisafinisovub.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49850195728.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dee90937ae5a03642dda66d4ed480af4/gagemuv.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df122cffe5201ab1dc0a399506a7bf55/jarufewibofirafiruzopez.pdfIn PDF document text
    • http://dzbnf.com/upload/file///73092777318.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/15848818533.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c8c61a40---85197050565.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/jojunudiz.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/76871527562.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/83508364361.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a3ff31c6ce6551aff225a4a220d5d9fb/difovovuxebokojekepiwoz.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c431d501b1dd5ba5ea251957c77e30b6/99884778818.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e46bf5bb85e16f0c968f6ad5879afca3/kisuriwaxunu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c3dbfaf2---20863671998.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f83c24c0---94568573531.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0d458b535b25a2256e6f23a8bee5ab36/48022780300.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/474ji1efenq41jnbckrpuo6me2/limoxaxubazijajan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=toppers+notes+iit+jee+pdfPDF 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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 17988 bytes
SHA-256: 0a8fe608281d85e692ea6eb87a769514341af073d2c414c27d5b41c3c7b9e40c
font_02_sfnt_off00013737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13737 10376 bytes
SHA-256: 8c9e9d482ea0b6bfddfca80af01e2cfd164dad6c0c0841897f54847622f3520c