Malicious PDF — malware analysis report

Static analysis result for SHA-256 48643c842d7e0707…

MALICIOUS

PDF

81.7 KB Created: 2021-06-26 10:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07eb20ba95eaefe2d6adb4e871bce5c3 SHA-1: beb8a0c4adfc0c5d5610eb30365cfe366e8204e6 SHA-256: 48643c842d7e0707ae3807c3b43b5e9900fc9afa9498491393412733bc2cf21a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly show a pattern of directing users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e433b658e---vizafok.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f18e5697c32b735124e3ded4041a9aac/pilojumujekewazetegijo.pdf
    • http://lalinpress.com/ckfinder/userfiles/files/gupobetujezifinijerut.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b45a0d4252879fc9d356abad9571a81c/xivusixesejutujuze.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/siluzunat.pdf
    • http://barcelonasixtytwo.com/userfiles/file/demitefulav.pdf
    • http://szao-spb.ru/images/news/file/45425072081.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zewawuzowapegi.pdf
    • http://rkmaster.ru/uploads/files/benerofoxuzejux.pdf
    • http://omgmediatank.com/userfiles/files/xokaj.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867fca8100b---dupojopasatorasibeneg.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/44413a734cbc57e4bb1a2debffc500f0/vetuf.pdf
    • http://rapabzenec.cz/obrazky/files/5680496367.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/43911040949.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dejiboviga.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a8ec315a---nekeroxedezajakofa.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fea8a0c73427fb0eb53d037505b2772/41369214427.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6dof8mrr11sh1ekhpbb512rq0e/babavuvikenonimujixiz.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f621efdd---zixad.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sqd08advs119fqp1iu7abub1p4/29507934445.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7c2cad70e18870ca50d3408e87f87643/65389318085.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/smok7qd3fbbieu8l6q89b2odl3/5907448465.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951a126e1e3---64314520743.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/6c13fc52a2467ebbf5a1a04b98e77836/86838475771.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/h2puh2e34ibcostlrvk2pk7v07/75988663775.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=carrier+service+manuals
    • 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_off0000df16.bin
e2c881db7095142c848821151e80fb28c32a782f78a575c93f380d14909c7950
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 16536 bytes
font_01_sfnt_off00010a1d.bin
20b26efaf84395ff5ac91fa0a932880a665cf876813cd5e9b653e45bcf4dfe37
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 10372 bytes
font_02_sfnt_off00012188.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 16792 bytes