Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48a7f91865d4010…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 15:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 61df730a665fd0e694da9b1d7fdd1413 SHA-1: a91fe2117a4dc0843b84e3d806194b4c4b3682b1 SHA-256: e48a7f91865d401003bb51d750eb80930e3a0b3e0aed0b08383c1e3e3771ce1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It leverages SEO poisoning by hosting links on compromised WordPress sites and disposable domains, disguised as educational resources. The embedded URLs likely lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=pearson+ib+biology+hl+textbook+pdf PDF link annotation
    • https://kisikana.hr/UserFiles/files/63779810742.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/modumetulukuma.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/62e0d9235c959829370b2f5603404486/80352685985.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/lodexuvuribawafalu.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/latuse.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3cedcf6ea---53525353291.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14602574010.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f04ca885a---91713438735.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b287d3b4c3d---fepovekorukezijavubofono.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/lajiwojaremekutumanarojup.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/28040844503.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210630045304_9vwbcg.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210810141438.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/35615441900.pdfIn PDF document text
    • http://mayjack.com/upload/files/nujitevelivoxedizisesube.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/98940963106.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7a2cef98d4d35b8397c6334755fca399/karevexafisabitupatep.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/35163133456.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/ganipenagazukudefotug.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/fufarob.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/resen.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f5099c20---vawev.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858c3631228---65748631699.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_off0000b85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85E 16040 bytes
SHA-256: fb350fa801280759f1071c08ff68edc25b210ca52dadba55f1ff4a6f2446b8a3
font_01_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 11224 bytes
SHA-256: ab07cb6c245849d8dc476266fcaa48bfec70d983bbc45c51912146c2035bfe9a

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