Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d1e8c138778800…

MALICIOUS

PDF

88.4 KB Created: 2021-09-23 03:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0da86bea229c5c14ff45114145921468 SHA-1: 2453e2fbc3b7e77a7cf9c6bbbd810418472cc8b8 SHA-256: f8d1e8c138778800cee31afa16052499e11ca78038174db074820c1aa602523d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It impersonates cloud document services to lure users into downloading it. The numerous embedded URLs suggest a link farm designed to redirect users to malicious content or phishing pages, likely serving as a delivery mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://crewmak.ru/uplcv?utm_term=librivox+app+iphone PDF link annotation
    • http://autosvilar.com/uploads/ckfinder/files/supode.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf98dca55---kivedalifadef.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5r808uceqsokob45d1q14v217/vokurewimirogulodufijubix.pdfIn PDF document text
    • http://canadianrockies.info/files/file/gotapon.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13308286047.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905144909.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04f70695d---30660674030.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/magimil.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/mujol.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907150741_lgu5iu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/95657142801.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/27614341640.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/69254116005.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161348c11030ce---84234689566.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/31501315611.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/87813417150.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/19845739873.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/basutajufizamoguzep.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lusufaba.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/45884164403.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/38720661921.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/janebudurewojigomavivu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nq4ge45fooa554107urbe0re8j/kikelovupotow.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0b6e5ac4a4cdc0f86d55ef3eef3215ec/6720365888.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10304 bytes
SHA-256: fa7a5cc547778779d106d26d1855bebd6d129d967c75f7b97b3b655eb56f005c
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 17548 bytes
SHA-256: 504c279c992fe55fcd2f2229d2d77b7bbe2fcf0153b17a44a82cc27ac27cec2d

Open this report in the interactive analyzer, or submit your own file for analysis.