Malicious PDF — malware analysis report

Static analysis result for SHA-256 13de94de4e8b4ca0…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 06:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f213821ca51aeb221c793e75dc530527 SHA-1: 1ecdf8f412e87413389f968a8b490a50f64eaa2d SHA-256: 13de94de4e8b4ca0b5fa83e6cd4d1fa0406f100c551f8795732dd5a894f60ea3
156 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 specific ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=punctuation+worksheet+for+grade+4 PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4833a72b4---11131310753.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/18683569539.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b53f9242f88---dulerelokaja.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/26549554671.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097492045a4d---kuzojarife.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ec7928b3---78033049920.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/zadoraponofoguziliminokid.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6f03fbd5---levuduwupezurotine.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/87518050791.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/kunesozime.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/jojus.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95f873f240---xotinuroxubaz.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/3212180389.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12184351da---91734657949.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/gomuwitev.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075f48512104---dubidid.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/sawusokinudirazi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/juwijarepobijobavo.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/67767574425.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e646f043c1---42352702511.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429234904177.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3afc3748f1bbfe3edceb4535dce251e7/tanewowum.pdfIn PDF document text
    • http://mega.kz/media/upload/files/rejokufizanenasimikevafu.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/12541f17ec2063d0655182c1af9d5c42/totom.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jlgf074h90f6ovo6tugqb91f2k/30503193028.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/15d1a001e707eaa9863d82d4cd053058/nagomupavikovi.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kibagerebod.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_off0000bdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 16024 bytes
SHA-256: ca94af13391d682beeacabea2d931bac947e0ccb8c23a213c610391b5ea9e5ad
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 11068 bytes
SHA-256: d34dc02f46c17861f4e7b05d5a4a3907074ed90c0b37e2bceef0f272aa02d3c7

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