Malicious PDF — malware analysis report

Static analysis result for SHA-256 22416a8e03732c0c…

MALICIOUS

PDF

90.4 KB Created: 2021-07-15 16:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3be7bf2381637c75c851798efaabb6b9 SHA-1: e59dde49aab917d2f5d273c5d95c0fc522a27cc7 SHA-256: 22416a8e03732c0cd3aafe281065c51590bb577e84b559846e9a1f37582368f5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for 'Recovery secret / private key request', indicating it's designed to trick users into divulging sensitive information. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/094a52af011fe25d027d71dccc403680/sunudewutufetudutu.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/sjgmun4h6khhlgkblsll8g7ge3/98811630608.pdfIn PDF document text
    • https://ivanamihic.com//files/13243824229.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/wizejageropibubokenubowe.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/12c725e672dd87916e5c4ba72cea3263/25385258176.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d7300598706ca483ffd3f994c787f37d/32498382564.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/witenupusojigakop.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1449434448609f3ff9ce9cb.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/piniruduvasunutu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/40509c45a210d44fb104c1b7760435b6/likanupuvagadumewure.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052804032883.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d99970df---bepoxalipolexazik.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f4787f74---53631364420.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9c1d4d14bb0ec584256bd940e2a15b12/dixedubegumoxirivulitokip.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/mipumo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fozasepokixesug.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/10ro6vov6f6vem8tmu0dnn9hg0/28442286561.pdfIn PDF document text
    • http://strandedtattoo.net/file/67256877032.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/daworapovalibuwuja.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f06cb41a0cd4e3cf3e69de14b4ef82bf/womezen.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/ximazipamuromakakix.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b97769bcc8f---60345922587.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/25262857940.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/34472017910.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/46988943024.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/77294665690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+the+woman+you+desire+into+bed+ross+jeffries+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 11460 bytes
SHA-256: 9f7f2d4f85981102975ecf8e56bb390c9493c635c0dfd9f4b2a8e40b81ea87f4
font_02_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 17540 bytes
SHA-256: 2eb6a4b8c1e46b7b5b3ab8b632cc0779bc04046c0d9938b2885058e533560db2
font_03_sfnt_off00013cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF0 8476 bytes
SHA-256: b70231db6e1f25f13ffc5ca4a1fbb171552bbd0910376e2c7ff3a5e58ef85486