Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee82a5c970d69bd8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 23:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa98164ffb10206ec5fdde0602b47f15 SHA-1: 9f5b8d6723f930f0fb5130f3119fa24a20f496a6 SHA-256: ee82a5c970d69bd847de8c10e9802e0d97454c7fc550364a76d225ef42a76bbe
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=flix+tv+app+for+firestick PDF link annotation
    • http://cctsw.net/whly/up_files/FCK/file/20210903_214506_138.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/61055382285.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/83123880742.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613409ec17354---bodonefumapegijozolinag.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01550a4874869baa4ff2e40ea17eada4/73761794758.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090211477587.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/60614129096.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jekikotesemifota.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/96274768094.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ninawulesowena.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/25509440805.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/51294323172.pdfIn PDF document text
    • http://chieucoingason.vn/files/33340660323.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/migajalokinefirupiz.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/060801451455.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/melad.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pqpqoamg5t5rrt0730bdajdmd7/34015359449.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/mewomizopusolipisa.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/sosiwawozowetu.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/xefopebisesalajenon.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/sejewutojapejatasumudukus.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/85306887865.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/91949679346.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/vatigewuv.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/20212285497.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f8bbc0ea34033014da67ef1fb8bd74fd/diworakunupilexebubape.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_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 10604 bytes
SHA-256: f9e71fcfc8515005fc7bc8bf3bd4631e733942c4f1d6f1d4a773cc1b1e4eae52
font_02_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 17368 bytes
SHA-256: ffe2ba57205775ecb595ee5841ab5d3030395d2082ac55ab789b959c65d52631

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