Malicious PDF — malware analysis report

Static analysis result for SHA-256 890b8dca4b4ad30e…

MALICIOUS

PDF

154.9 KB Created: 2021-07-18 01:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 575f268c4ce225fcb4f5af61303bc3eb SHA-1: 4aa206b566862b785960d0b98573625374bfa852 SHA-256: 890b8dca4b4ad30e52223bbc7557103b34580252965dc3c90adbe6ba515231af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised or suspicious URLs supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/n1hq394adbdljd7il7igvlnnc7/vabopawiveporufiziri.pdf
    • https://classconnbio.com/img-jacson/files/bilujerinukimimolevi.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7171c3262---49892755922.pdf
    • http://5m-tti.com/uploads/image/files/7501312327.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbe9cd23d---sebuxiturumitiwemaluzob.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad05e4942db---89875592158.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/0mc4sl8clnnri8pfi0k72d74qu/10105191971.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e14148e7---29619213733.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/653156f66e41b2d369bb993e26c70b2a/ginewatiginubesataxazoko.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3560e811d8d60099dc2fae477adffb6e/91050682010.pdf
    • http://mp-journal.com/media/file/satewibizenerixi.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810808b0a09---10588832033.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e802041468c---72532994825.pdf
    • http://abaj.cz/UserFiles/File/ferigidu.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/56244271960f07636fc25e87f8f29a33/winomup.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a37d1239---58470812294.pdf
    • http://air-ned.com/uploads/files/minemepelinope.pdf
    • http://sanphamhanquocymy.com/uploads/files/77968181964.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/05831f75e8b2515885db06cdbf2152dc/57674551695.pdf
    • http://yule-sign.com/upload/editor/file/20210703152856.pdf
    • http://balone.net/_upload/file///xowezololadasoxoxek.pdf
    • http://castanienfamily.com/clients/74558/File/30606511579.pdf
    • https://ph2020.org/FCKeditor/file/35414942019.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/cddf884084086cffd4921169e2a25c9d/9968227165.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=echidna+and+platypus+belong+to+the+family+of
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fa42.bin
bde78f58d15e98982ef08303205588a8c8e6741e82925abc03bfba798556f6cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA42 11304 bytes
font_01_sfnt_off0002143e.bin
2fea0f47472d1ea5415de0ef4c6a7d0ecff2a9fc31811b3ed7f5c19fddb636d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x2143E 19020 bytes
font_02_sfnt_off00024594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x24594 16792 bytes