Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9399afd40b20ad…

MALICIOUS

PDF

81.6 KB Created: 2021-07-08 03:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e8bcedf4fc06efdb30939c4ad006f6d SHA-1: 6835a2da01e2370784b8206a11853bbc7e0daed5 SHA-256: 1c9399afd40b20ade37e6f5169651760afeb1f257930ce7ed4571c73250067c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=chess+endgame+puzzles+for+beginners PDF link annotation
    • http://simonide.org/userfiles/file/desomilotibarekenekisi.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f5a20fc233098d1f32eeeb678c5e61de/76091937203.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee8a51048---51532306907.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tigisimofisoxisebawe.pdfIn PDF document text
    • http://vswet.ru/f/79028932413.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/xugeretonib.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/dajem.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160886768b9896---36203497940.pdfIn PDF document text
    • https://agatanorek.com/files/file/bokubogujuvuwake.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/mobaviwagitepi.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/21677470876.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/seladuja.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062704351470554.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8f18290b59ed9b7efcd2a1cd01d8d5da/lobuw.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/9703887276.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ccc93cd6---59130749503.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/gikupidozudefegomemes.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5b6d147cf0ee84e344d8090627f59aad/vadixixobatulave.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7504cd78---44544178569.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a53aae09fc700a8cb15dd79cd6c7fb14/vogejepaguk.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/1748608438.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 11180 bytes
SHA-256: 457c4e4ef63158d479277359f6a6cf34b30d10d3fe1b41017dfce58e99d691a7
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 17240 bytes
SHA-256: b91ef70cac323c05318ea43adc1cb4782c40ea6b0db918098ff87bafbf92396e
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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