Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f041ba8ecbd073…

MALICIOUS

PDF

85.5 KB Created: 2021-07-17 21:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bacb8bc60a9590ded38f34bcf81b6bc7 SHA-1: 47274f02d14d24d08d53c7316fda777231aa6a0a SHA-256: c6f041ba8ecbd0737600277da59c1bb3874ada7d5fe71d3e10fe2f60f0724370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on a compromised WordPress site, with numerous URLs pointing to potentially malicious content. The document body was unreadable, but the presence of multiple links and the overall detection suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6cmc89uhv2i7uvuitlqflo4pr9/burumulibodada.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/bf4769d65ab9160cc58f870abc356d2d/14297125939.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/gozogiwivunaxujaralimuk.pdfIn PDF document text
    • http://hrudolf.com/userfiles/jamudewebi.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/sebamanugiwu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e567787bb---88825626608.pdfIn PDF document text
    • https://datajournonepal.org/files/japazananawadegature.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/89471671057.pdfIn PDF document text
    • http://apvn.info/userfiles/file/dolumoxikuge.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b64c94473183a9f5bddd86033ceb3a13/63180134851.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c2f1b388d8c89a6b738469dd5038f679/58740384688.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5937471a---jojujovuxanatizosonip.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/dimutaridalelazavav.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/47251077602.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a87d13953---bidogewixedelatozu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/nukakazarepifipisipozuni.pdfIn PDF document text
    • https://seikai.jp/free_images/files/pigebarajotufenuxiziko.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602014925.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ecb139ee---zazatarimorivare.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1890944480---bogisodutodolulaf.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/3552031631.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc1317d86---fogoropezemetufoxox.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/be7c1d285c5d7f949ce74fc453c2b6dd/38537701216.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507035228291719.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/6023f7a2de3b64d407fdd4e638b90ded/51319170310.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd584e0acdf---jakozedoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=just+the+way+you+are+easy+ukulele+chordsPDF 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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10652 bytes
SHA-256: 62fd6be5cd5d20ac2c8e740e6e25ed06550b1fc5962549e894b461ff4d379641
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 16980 bytes
SHA-256: 641550de219af9da9c00a3d834a47c2fc77c5d5a3401e968fa6c63e36da56f38

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