Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae840fe4bcb6301…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 11:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b329948790b634b6439ac1348d28520d SHA-1: ed76704a4755cb809feac3ad9af7f3bcf556aaba SHA-256: eae840fe4bcb63016a0241a98bdd69e895da2e4d791508e8b468360809cec26a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://drafthe.ru/uplcv?utm_term=how+to+tell+your+work+experience+in+interview PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9bd1c646b0b9eceb5bd0e523b39143b2/2962772954.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64d51ea23b---regiwudozogabuzedav.pdfIn PDF document text
    • https://scriptdd.com/_file/file/79546493646.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fufepabanogefabusuzaziveg.pdfIn PDF document text
    • https://majubesar.info/contents//files/pufevagut.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/46330592672.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c487a24463169e774644d21230fa1cd1/jasanogizufijotu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cab158d58a9---38864889876.pdfIn PDF document text
    • https://appfacile.it/file/34340432453.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/6724052893.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/26765042307.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c417522d1e6---27669824711.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ba36e464d64dda95e5b1526342a9f296/mogoridasolisorupin.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d2edd4i7pgmcj00ieelhvj2tr/lovidufunazike.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160855ff08ab8f---bufet.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052900591196.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6e661c0f---93275576049.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b606f9918d---zevuwudejum.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/78715105999.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44a21ae5c---gejitutijubafuzediwara.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3886f23029069b3381512af5dc33d19b/12977728445.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074926b49c9a---jazabanaburi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59060ab2a---zufivizumanaxe.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vimeguk.pdfIn PDF document text
    • http://fitviewer.de/files/file/70721875398.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/46193011299.pdfIn PDF document text
    • 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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 16380 bytes
SHA-256: 1df93536cecbc31a21ba5f5d3c1da02380ab1618f576eef70b0b831d132d8793
font_01_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 10588 bytes
SHA-256: 50e6ce1edd409a01cc84c1a6ce1e284f98b61965ec2b8210f42f4231e65295c7
font_02_sfnt_off00013511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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