Malicious PDF — malware analysis report

Static analysis result for SHA-256 3985fffddda0ac02…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 21:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5005c827c679eaeed93c3483324c7506 SHA-1: 825341fc86fc455b61cd60fbf65eaea85b904d3a SHA-256: 3985fffddda0ac028f2dd8bd2341085d3eeed1aa8e88d21e858523559c14734f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable hosting, indicating a likely phishing or malware distribution attempt. The presence of JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://acevina.com/webroot/img/files/14400616127.pdf
    • https://futurefacesmiami.com/uploads/file/luxuserojebulosuliwubu.pdf
    • http://bassonconsulting.mc/userfiles/file/tovexedagi.pdf
    • http://dongsimkindergarten.com/upload/files/tulerapolekadomemem.pdf
    • http://kanalizace-ul.cz/userfiles/file/83999673716.pdf
    • http://giasudaihocsupham.com/Images_upload/files/zugupojapexukalanemo.pdf
    • http://printific.com/images/contentimages/files/90504516179.pdf
    • http://musclecar-taps.com/js/upload/files/zibiwedajavuwujedufo.pdf
    • https://apotekatia.ba/fajlovi/90424966999.pdf
    • https://madeirashopping.com/userfiles/file/67800193947.pdf
    • http://att-na.com/upload/folezuxapetogadogusatusag.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e80e331d---53820471084.pdf
    • http://homeopathyhongkong.org/files/ninujurigezulelutudiju.pdf
    • http://osstemcardiotec.com/files/fckeditor/file/19619951613ddba7392f0.pdf
    • http://3wsystems.com/shipinc/userfiles/files/fagagukuk.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/56964884732.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/tanavuza.pdf
    • http://revtechnik.cz/userfiles/file/gijusakumexabifu.pdf
    • http://llux.vn/uploads/files/dotokebalifuveni.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/vizefigoseja.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/wituwe.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2602c6fe12ed4917dca1235b9263a2ca/35868395566.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/53032661003.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d30b3a6d6---tatepuketetevimubini.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134c64ae64db---52394845311.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa64738a2---14002126755.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pixomatic+background+eraser
    • 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_off0000ec02.bin
7289697cea04c606714ce2f3d6c47133cce8c5822f8d4e864d99ae759a6b1436
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 18192 bytes
font_01_sfnt_off00011b9f.bin
60237827cfa17678090871841637196c957959cada808c3066625813bb3064b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 11100 bytes
font_02_sfnt_off00013566.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 16792 bytes