Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c4dee5afb995f9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 23:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01fe1ec4a4fb6e686aae3247eb8d98fa SHA-1: a8eeff720f6e63aa8c672b0cb59c109b4c199f2f SHA-256: 16c4dee5afb995f96fe37989319fcbb4bb4f1fd8056b9a9cb72a51915e3859e3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous URLs that point to other PDF files, likely for SEO manipulation or to obscure the final malicious destination. The presence of multiple compromised CMS upload links further indicates a malicious intent to host and distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149746594c04---firizaz.pdf In PDF document text
    • http://coumert.com/images/file/bijuwuregujezofexanoti.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/39819757055.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/bovobaj.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/46431423477.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/vopin.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/zutem.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/fedew.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210912185442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413140930f8---gefozorutesun.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/14772794850.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/19536460597.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/pejaxepizenivuzod.pdfIn PDF document text
    • http://maulich.vn/attachment/files/saxejiwimewowe.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/46297941788.pdfIn PDF document text
    • https://bliznacite.com/files/28895055048.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/55782599790.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/18366932551.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fbf0c19cc---surumotazujipekoki.pdfIn PDF document text
    • http://soc-in.com/data/media/files/vexumotaxunikosejoferi.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/22696453536.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/80567948576.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/61131155434.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/pepozodozer.pdfIn PDF document text
    • http://sadrokartonyhk.cz/images/fckfiles/file/74835459926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=talking+pet+app+free+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 17696 bytes
SHA-256: 2adf54df888e213382f9e4a4dd80e5827e254cb5c87d2bb5fc4ac0fe04588ee4
font_01_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 10560 bytes
SHA-256: 507b0b849ba0dbf99a281c157cb4c384da13b1080df49d46c9756a10db3e4e33
font_02_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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