Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ae5749f41b157c…

MALICIOUS

PDF

100.3 KB Created: 2021-06-25 20:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de008df4c3c14887c03c748db7b3a79f SHA-1: 787b4dd21aadb62fabd0f5d7acd5936762e6b4af SHA-256: 88ae5749f41b157c6396c4d0da10240df28e912e7adcc704ac9dc6f20d0c5880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://drafthe.ru/uplcv?utm_term=allegory+definition+and+examples
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd191e631---zupifasaxigezodepilofu.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdc952cb3---mapilowakudikoxizewimaji.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51a0d4da3---bowisirawidudok.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fcs3fnfi5vgbqe7bj07g52ifp1/40417711993.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cd03b2ee95a---5804553135.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607646cd2c885---zitofexes.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/451748f691f8a0cb3f9a58665631bd54/39611602051.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/bd2e8fa62ace090f00bf5b5c2ed04c6c/46867367788.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea6ec52a---karakula.pdf
    • http://aihyang.com/userfiles/file/jogawotabufuzobigorojer.pdf
    • https://avonsteel.com/UserFiles/file/mejenetiwowe.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7a4458e67e8ca01ae1774913ff675422/junusej.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0b6bc40c0b58a132a66d53a6b3c4a1bc/gafuna.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39008a3a2---97577803950.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jc2o4d3mspncm6iktuv9ra12v3/fopumafujirufikuxita.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832667f3d2---13499466257.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b8751d15---mopeliwabaloneritazi.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc038503a1e---57870222766.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d11cdb8e---pafesibajibere.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/v7dg7c50nn23fs3jd6u1lupq91/9766838808.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/41ql4k03urvpnkg3a0bccjohli/tetasiv.pdf
    • http://asset-books.com/userfiles/file/midug.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a10093d8360d0753c227d1d743c2a896/zuwotadin.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7a83befbc50b6f965b67686ef829d1a9/91548505573.pdf
    • 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_off00011dce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
font_01_sfnt_off000135e0.bin
2a0672b7c97b6d79fe7cbcf9263fa3e9bad317016cad705ebfba71a656d76afc
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 21052 bytes
font_02_sfnt_off00016a6c.bin
deb922d8a197faf9f426f72142e75daab2c973888f5e26ea0bb8cbcb803a54b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6C 11036 bytes