Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b8d13eaf3910ac…

MALICIOUS

PDF

84.6 KB Created: 2021-07-21 01:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4151d853f7fcdf0a4fe905de7b1864d SHA-1: a39d5a75c8f781a4ca74c0f59cf9897b74147bb8 SHA-256: d8b8d13eaf3910ac6122c0eb6ed39b4150b1a25b8cd0b0a3453b1c74c53054b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised websites or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the presence of these links suggests an attempt to redirect the user to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869663ccd43---23504305359.pdf In PDF document text
    • https://mrdak.cc/uploadfile/files/kipimolusuwivudikiwokopir.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609407a7a7574---95938835811.pdfIn PDF document text
    • https://hsse.cl/files/89060878354.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/80707360845.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ed497c4703db83033b3aecae8873b0ec/69627666787.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/iq3lh2i83ntule0n3olhobev9s/tofanexadabisawugufoted.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9eca3e77---sajexoludedesifuj.pdfIn PDF document text
    • https://papiratisk.cz/soubory/tefutoba.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/0b48781967f6949525d49b4e86347dae/zibutesasakid.pdfIn PDF document text
    • http://placc.info/up_image/xazinedagizelep.pdfIn PDF document text
    • https://kildevangen.dk/files/14058911698.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0lb714cuvjs8k9l5719frs47gc/86345587532.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/75914005638.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aabd5d9c---kipozinor.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/nuwemed.pdfIn PDF document text
    • https://everestart.com/images/stories/file/11254549109.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6ba90eb59e3653c4416e12e408f40ccf/bumamatifanopipipotad.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kifufudegibikosisinasu.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/98046052740.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4955a940---vipazipikenavewagubo.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fbfcb20d---22163003494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lossless+image+compression+using+matlab+codePDF 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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 17828 bytes
SHA-256: 6b8d0997a0b7406d90ea04ac14fb119837fa1d8563c1bf127cfcfd0145da5c9a
font_02_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 11052 bytes
SHA-256: 30047837568142494f4edeb4f76ff2b0aabfc91b6c919d97309bf704c068c23f

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