Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae99558066b3ab5…

MALICIOUS

PDF

96.6 KB Created: 2021-06-28 02:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d76e808cf4fcd7353ea12d7f132e4620 SHA-1: 8cf3572ea597c08db2e1cdbd582bf09f1ae1f5f0 SHA-256: eae99558066b3ab587073f75dbfcac2b32effaecdf10758eb6d485cc7b4e2663
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware delivery attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://irlanc.ru/uplcv?utm_term=what+you+know+about PDF link annotation
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608424116cc6c---715009472.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/tusuwubimidej.pdfIn PDF document text
    • https://tonitomov.com/picture/file/xijopufitado.pdfIn PDF document text
    • https://amblamy.ee/upload/file/81622486197.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/f5tdagm11bohkhe9dkah436ufs/miwajijumejetu.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8b6b0b7188b5d49761957523ff930ad1/kalijekefoseta.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xetaredofujijukizenidub.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/91369447224.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/96531339658.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708bf440229---fasukofasupinemi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/77021306111.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/12f2dd2f0d9454f6929579e13d51388d/67041435977.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/24119265827.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f878b684---tenuluti.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/5b980c2e8887b8378c8da12b358864c1/91543117205.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mimonak.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/debq3vu4j3elk8ugkct7bgqtue/tutenasoxiwef.pdfIn PDF document text
    • http://garderoba.sk/images/_file/54701711129.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/vabef.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b81bfe085d7ffb279dd0a1bde48333b3/tudejisiwobusa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2df74ee2bd8b464b212ab86fdb8b2822/bunafotuna.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071434291872.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/66962589273.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011a79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A79 23624 bytes
SHA-256: 9bbdb439e846098cad0d51b1d9e094276ebe223462220deeb90ff84b29f455ad
font_00_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10192 bytes
SHA-256: 38ddd7ef17e00f98dc351af04bbdae423a73709b94661905c191c09c1aff1c78
font_03_sfnt_off0001441d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441D 17644 bytes
SHA-256: 7a7db5211b8258d5e0772f7b41d4a462d67863076c6669ead7f07b7bf67f378e

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