Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50991b1891ed1bb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 09:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f318bfb287bedc625e091e11680fe90b SHA-1: 6ed0531524cec35b37c439bc98efaf0502d864c1 SHA-256: f50991b1891ed1bbb81e04b2ca7c8e4028e2bdf13c8270bc681a5f2daa144463
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. These links form a link farm, a common technique used in phishing campaigns to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biosurfest.com/userfiles/files/bivuzajeviwagepivunuw.pdf In PDF document text
    • http://kenshopvn.com/uploads/files/95928150364.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/domadofel.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/98697585996.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/puluberuwigirevasiwiz.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/36242692513.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822b9bca3b7---nivitasujuzavubukamu.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/36546479935.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0muetp1d44jgv6grnnvkpf0glk/69075775854.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/vivojufewurulozofop.pdfIn PDF document text
    • https://network-italia.it/file/36245272361.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70c647845---kifabepexegotibegir.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/521cf9d8521b1152a3afc8deb4d674cd/68168480720.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/12738213125.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/megam.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/bivima.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/33767126287.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3867b389f1d9c9660bd1ac4707cea2d2/vumusunevaw.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/2297068711.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mo37ttr5s9j7craddt83q45emu/tesupegegidukugakuworeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=myria+espressor+manualPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/biludu.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_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 17188 bytes
SHA-256: a6950a7ebbd24b3e94f4a6580bc6b2cc048688183f2ff6d9453160bb0ced0c27
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 10520 bytes
SHA-256: f458d0f2cc79b2000e6589f4659dfc2bff8df15002324c96c549dad4ea43abe2
font_02_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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