Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bf89d66c6eb63f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 16:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0466257140c8a76ea7f50c62842e7eb7 SHA-1: b526d638f6d42a91eb0dd362d1f641f8723ff714 SHA-256: 53bf89d66c6eb63f67d9db64c1fb3a4f8b30bf78b252b3e9a61c11e9b906d2ac
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect the user to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aartipalette.com/userfiles/file/24212909152.pdf
    • http://brandnewgoods.net/userfiles/file/8905652068.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/12e26ff2de2734dbd3c7fb9309610acc/xezaxi.pdf
    • http://amuseonline.com/absite/userfiles/file/kamegafukemikozerolu.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c90e39b641c---bigidabajekesuva.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084059e22750---zunumukumes.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a8316bb4---rokovazag.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/324f6570fe502d1401488f1bae10ceba/wavararixuvanegubex.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/56de4b35dac694aa1c75e0cf2ee11b8d/mexubifiboworojese.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/46314a3caf189c939853a0dbb126c0e6/79577183566.pdf
    • https://betalinktech.com/blmedia/file/60203762173.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d7021a949c5a817fe6d07bc691dcfc04/pivogezezopunek.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/29f37d70a6248ca97978cd48e1dc6021/23704336702.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcac2abf1e---93926116065.pdf
    • http://healhumanity.foundation/userfiles/file/beperudexagifag.pdf
    • http://namngonviet.vn/user-/files/peniweguriruwatisawiso.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074779e20589---kegesenanomijap.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2e08865d82fc992061be30bf6eef7616/9748417981.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9df580c2---xuramuwesal.pdf
    • http://tnslib.net/userfiles/files/lezosixopukafit.pdf
    • https://stef-nancy.fr/upload/document/vabipunerudirupezosip.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7781caff0f3eef0123c9455fac2d71dc/politis.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0780295e---mabat.pdf
    • https://healthmatters.me/userfiles/file/69739899817.pdf
    • http://remaining-mc.de/userfiles/file/37004863645.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=unstructured+data+collection
    • 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_off0000ed9f.bin
29cafe938ea103695c9c134a36d3e3f9ad3a13bfcfd1bb0f869561827d55a341
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10468 bytes
font_01_sfnt_off0001057f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 16792 bytes
font_02_sfnt_off00011d91.bin
9812dadca351fbf0b5bc843aa4c79fddfbfb9a26e08acd0d9644272f1e0c616e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 16636 bytes