Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ff57dad8ea2f78…

MALICIOUS

PDF

70.1 KB Created: 2021-10-09 00:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 350971c9a4be249be299edbacb1630f7 SHA-1: 70651c78286a392164ac6bec8b2d30cb7b7ca1ef SHA-256: 76ff57dad8ea2f78c920de9cf94bab1e2efb6eb1fb2e942cba690a47ea3f02d6
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous external URIs and link farms pointing to compromised websites, suggesting an intent to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=usb+tethering+ps4 PDF link annotation
    • http://1855-4080.com/userfiles/file/30706308243.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/lujor.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/89552823187.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/96720859460.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/5017452489.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/61316562498.pdfIn PDF document text
    • http://serting.eu/userfiles/files/suguzoku.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614464e174910---zumugo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1615b770dbf736---giwevobadok.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/099e3e6718439aa1a77b438f85a7b74b/govupozo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149570463320---jijibusubobuvulidutegij.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/4909497529.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20211002015026119.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/koxiz.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/xebemuvujoguzurotaronu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1a01hi389ge05323bqafmj176s/27797306019.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109080819234395.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zuketisebisad.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/kixuzitamiparagej.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7bef4ca58e97978ab75ff31e96475474/basikekiduzavevasutij.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/voritixekofifabezomiro.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/pazametujotezugifej.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/49530694651.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/figesojenurug.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16160b8cc21b14---xesozolexupemajefaxa.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/fibuxedonusatoba.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/64b6bb7cf1d56702451c511ffa99c95c/35084660319.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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 10428 bytes
SHA-256: 4eb665326a1839713f0e31f9668df485cb305c93bc1a20971fbe624dcfb284b1
font_02_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 15040 bytes
SHA-256: 7f69145ee4bc0d53a8a6c7f05a0c73d9695777bc82c166c32ad3913cf9e63fce

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