Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c9e8f5e136d8f1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 09:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8527fdb762f652b50008dd0c6f63a83d SHA-1: 2d2bcc525c53089919a7104649917f612823a3a1 SHA-256: 55c9e8f5e136d8f14d29c0d99409b85584e9c64c8ceaa516942743988217e65c
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links strongly implies an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=porn+adult+games+for+android PDF link annotation
    • http://beccaro.it/userfiles/files/39784278357.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd14c6b954---45250175633.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/48488496180.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/18098833485.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/83699291654.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/83166228625.pdfPDF link annotation
    • http://jungam21.com/upfiles/file/1631273316.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/50834810047.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/zonumos.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/44798233289.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/vaxufawozizeveni.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/435vgnru479ecedi4ot6cjvpsi/padibisozin.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/22932927566.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/luzifepid.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/nuvevagetojugokad.pdfIn PDF document text
    • http://web5gstore.com/Files/files/34700604322.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/75385415210.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/wiwowaketojeju.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/mibexij.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/dorudenukinelenuxejo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m5nuke6u5tc7sci95rgsk8p2t2/tabuwupewilirisofavi.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/mazevosigexo.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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10796 bytes
SHA-256: e776915b4468fd602a39db95c30130cde0cb3199022231c29d87df2c963bb022
font_02_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 16796 bytes
SHA-256: eae28bb342425e46783a9dcd3e1a5deeacc7a4e309ceca34226548833ce57a8f

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