Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb62a70d8e2806eb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 03:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51959ec7f6a92159905834b69f2d481e SHA-1: a7bb90da1e0dcf1c46f6eca3c99a2eba7fe86f93 SHA-256: bb62a70d8e2806ebaad641bccb59e69beba2a4dc121b14708ab383c37f4f8a3c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://harasim.cz/uploaded/files/rujiwi.pdf In PDF document text
    • http://softwarefactory.nl/images/file/zolikavow.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/walaziruxebifelavurumizo.pdfIn PDF document text
    • https://latework.cz/soubory/lawekerazolonaga.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b6kaj5dhveiioqu99bcsgad591/rasarusepabalojivugoteg.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5aehfj0r4h9fg69ed42fas207k/naronaxemidetepisiwuv.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/90660190658.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/17832582439.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/jivezemotoru.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083df409e447---75398180507.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/50416237185.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b7883de7---32817633800.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vetozuxufowimosi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fimosedolumu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266e1a3bd1---99289940060.pdfIn PDF document text
    • http://i-dron.cz/data/file/joxidiwekozefe.pdfIn PDF document text
    • http://sns.hu/_user/file/delab.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627683187.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14bf4713b---judevobomupaxalowoxoz.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/012e62b1e1da834336340af5c709626e/sibusuvibiv.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/77422d7651890aa63e9362819f093ae1/42928640401.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e30fb9ed619---73579928196.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d275f1e61e93ae84e1027fdc682553d6/83762199735.pdfIn PDF document text
    • http://markone-tools.com/upload/files/17592800228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chamberlain+garage+door+opener+whisper+drive+plus+manualPDF link annotation
    • 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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 17688 bytes
SHA-256: 3844f41da074d0ad3c67befb1bb19885223f85d78429c9f4490838cc3b680e58
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 11164 bytes
SHA-256: c414ed8387c07dd7294bf23c71115d3d953d58dcbe5949ec1c30c9ef74483349
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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