Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1fcacdb8d22802…

MALICIOUS

PDF

86.6 KB Created: 2021-07-26 12:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b41fd5784aacfaca8ad939940a2d612 SHA-1: fd48ee053c71b4f0f9bb6430927b0824ce290407 SHA-256: 5b1fcacdb8d22802096bf66aae79a5b85f8d72dfe4fc0409263ce2cdbeb67a81
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dyglas.com/userData/board/file/4571560320.pdf In PDF document text
    • http://geometrarontani.it/userfiles/files/xapuduzovasazuzuwuk.pdfIn PDF document text
    • https://egca.fr/userfiles/file/pomop.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/55822152707.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/ziganugofowemixabolujan.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3e6dbf19---morudefufoxifaxajon.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeed66f487---fudizirixisujo.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/1510679483.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/sebijezusi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3d57e91b8---61538932968.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df090052f9---kodoveturoxazerir.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/17/68526626450.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/24629056055.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1b6cd5fab2136f338178ed5782d10326/15176639846.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/l8dgjm00vij25ajk76kssnjdnc/gozajib.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/adfbd6b17e3ce05a616141a21a7bbd0f/78856309443.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/wimujepezutewu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5472293d8---tosamutezero.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/witenedeketutere.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/jatafebuzifigivifoli.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/638bc9212328dd366b468670ee059707/xukuxinonerekubutikusosow.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mcc5gbooji7v89su9q4ivap6kq/noxolepumolupifosijosiv.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/30559585999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=new+bollywood+movies+download+2019+full+hd+filmywapPDF 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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 16712 bytes
SHA-256: ecd512c7ade1b9a2472d01f90208365c5764d6fa376b8fd23ea71a6b422f3cef
font_02_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 11512 bytes
SHA-256: fa4551f56a690bf2f2473e05d43ab805bace436bae47ad011397a0d9b5883583

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