Malicious PDF — malware analysis report

Static analysis result for SHA-256 886cd0beaca0f6a3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 22:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a43933636c47b78c51d43dc36b21602b SHA-1: 851e72a74f00e34eb785caab16d54371751bae71 SHA-256: 886cd0beaca0f6a31a74236de0adb96a60ddc22f83f82c3d42a3ebd8db395959
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 are hosted on compromised or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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 https://silatur.com/js/ckfinder/userfiles/files/5335222407.pdf
    • https://searchkar.com/ci/userfiles/files/suvewozirawizi.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c086bd8943---bevevepoveluporumik.pdf
    • http://mq-water.net/upload/79252261050.pdf
    • https://lochoanggia.com/upload/files/jimosos.pdf
    • http://www.dereformasenalicante.com/archivos/files/92887266182.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ltrv9fpq35ebhiu95cak2ob7d/68467241613.pdf
    • http://americasbestwingspa.iorderfoods.com/uploads/files/68144604124.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/rixigokude.pdf
    • http://driver-jazda.pl/upload/file/18004766113.pdf
    • https://tainandentist.com/uploads/files/202109022214275971.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/86400771610.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e46c8852---wazafeforenig.pdf
    • https://moolans.com/uploads/files/romaxak.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8b01eb85eb23361c4bfce0158f2bec88/bovujufiwazaxuz.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/54656408845.pdf
    • http://dekoblickfang.de/userfiles/file/zegibovolubokugokij.pdf
    • https://hotelgaric.com/upload/datoteke/guretujomagulunodenavuba.pdf
    • http://location-appartement-venise.com/italie_documents/files/gadarasukimiganevejamili.pdf
    • http://onlinecommerce.bg/uploads/pages/files/vitutedufoz.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/vagufuropodigatawax.pdf
    • http://poketomecam.com/uploads/files/difakujenesavike.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/73360139045.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613964e7b3a8b---fudanerowene.pdf
    • http://valencia.thepokeluau.com/uploads/files/vegowovi.pdf
    • http://zajazd-broadway.pl/galeria/file/xozekepud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=among+us+new+version+mod+apk
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c732.bin
694586c1d20374e4405ace0ed5ac36dc65fa512492921b5cf860e57f6f44e021
pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 2052 bytes
font_01_sfnt_off0000d084.bin
04943867e9ca2d545027ab747fa594737bafef9446fb32b5dd6e67ae156996dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 16256 bytes
font_02_sfnt_off0000e6a3.bin
9bb9e019c06ffc111cc1e43d66eb5e3a06f1144c750be9caff158589b1db1e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 10916 bytes
font_03_sfnt_off0000ffcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 16792 bytes
font_04_sfnt_off000117e1.bin
1801bf363cfb93ed697b2412c14abc9379c1616197748fbe80d2f7341663fc1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 22572 bytes