Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aaa633ef24948e…

MALICIOUS

PDF

81.3 KB Created: 2021-10-10 10:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5fba47b5b8c114531f282a4572382318 SHA-1: 05fb5414cf2499bc5c1297bd3f9a91357ed0f246 SHA-256: a1aaa633ef24948e125ed1f92e0f3393ebe3279a99798c5b9a81ce2d49736aac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

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 https://huntic.ru/uplcv?utm_term=how+to+open+can+without+opener PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7b1d098c5c1330080ba7efd8973a35cd/xesimilepamovupow.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dr9s9hhjd85848p2tqbq108bfq/gerisot.pdfIn PDF document text
    • http://esistore.com/userfiles/file/35757417289.pdfIn PDF document text
    • http://progetec.org/userfiles/files/66316314387.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/74331650952.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20211004203257.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/viputalomowuwonenonaduvo.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/58958567068.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/tamunopodol.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161517307dbced---10956628230.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/mevibitanegoxi.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/54644269206.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/60119583315.pdfIn PDF document text
    • http://zuche0551.com/upload/file/77341092419.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/155506994661449d4ac960c.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/41938734212.pdfIn PDF document text
    • https://dellrein.ru/content/file/loxibovemagilo.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/kujofejogukapumowofave.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/45527069825.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/bumulolabizoxiliraz.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326a31b63fc---60740727485.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/98966111407.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/zojukibepubonipeta.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/13446599901.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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 18212 bytes
SHA-256: e2275abc54e7fdeb54cd2d62e0ce14fe634e47fa8f12754d49d0ed8c3930f558
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 10432 bytes
SHA-256: 583013c4cf0b0a1d47c9aff0514272e1476caefe4cff7ad368bb425f19642f7f

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