Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c61066049ebe64…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 06:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b83641400ef2fd38135e3a4fcd6d976b SHA-1: ae44b976b59f3344fc77d9daeaf41fcdf267bdf1 SHA-256: a1c61066049ebe648cbf3a26f486caaacc905d62cfdf1fd5a0cadfe09fc29fd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/jarurasareluwajagonafi.pdf
    • https://hebatkeren88.com/contents/files/putenejugumurise.pdf
    • http://group-anons.ru/userfiles/files/jukezugepije.pdf
    • http://alltechsro.cz/files/tegil.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/70846892638.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/jususesukabevapesuve.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/tekepunugunovoreni.pdf
    • http://dulichtantai.com/files/uploaded/files/30587233229.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146a5bc45d93---85862002101.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/14263783743.pdf
    • http://kitpaisal.com/mypicture/file/94167565072.pdf
    • https://bhsbeacon.com/FCKeditor/file/23045553474.pdf
    • http://jongauger.com/ckfinder/userfiles/files/vetow.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3d9f4f94e1b563a75d07ee38b177652e/kopijorevanu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4db77a344---lewakupabuwulevukizovi.pdf
    • http://architettosirocco.it/userfiles/files/guwinoked.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/lezakapi.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614223dc2c604---mowuzududigadur.pdf
    • https://zweefvlieg.net/userfiles/file/67241539892.pdf
    • http://acevina.com/webroot/img/files/gopopipabelupa.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/gubazikavapezotavitorirub.pdf
    • https://armature.ir/cache/fck_files/file/jenofuz.pdf
    • http://blow-w124.com/js/upload/files/todenuzupeniwibativa.pdf
    • https://drnanemilk.com/tctt/sites/aaa/file/jolubusirawafikutegisof.pdf
    • https://axlthailand.com/imagexx/files/5736399756.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613852932ca6f---31285608336.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rush+wars+download+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7b3.bin
314dd8c0f04eda3a258bc638968223bfc268996f44967318dba2b55ee7a40a05
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 17048 bytes
font_01_sfnt_off0000e3ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 16792 bytes
font_02_sfnt_off0000fbc3.bin
3536f9da21ac6d088d1e339c6e02127e76352eb660c1ea030a694fc9ae12eadf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 10348 bytes