Malicious PDF — malware analysis report

Static analysis result for SHA-256 06888ac2ec833de1…

MALICIOUS

PDF

82.1 KB Created: 2021-06-18 10:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eff2bb211f20bf3544f82a5d1b79b9ea SHA-1: ab1af9c49af865e148fb89eaadcf3f1c7c6edd41 SHA-256: 06888ac2ec833de1f300d1376add63f21dfa576e5e3247b9e74ff92a776d31b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan variant. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3nbdmg774jrk3j9omb1kct1h95/wivujedofen.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a279cf8d5db---vowoginuredezixumuduzo.pdf
    • http://dentherapia.hu/files/file/59090871723.pdf
    • http://dynamic1984.com/user_file/file/retirururozopetote.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/5878481667.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c93fd80982059a9e8a45d7d5734dce7f/bifaziruxi.pdf
    • https://idd.no/ckfinder/userfiles/files/4751463420.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/62d3711965fdd60c5f759e0ab642887e/97870917691.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/lerozubemigelogilupov.pdf
    • http://camonetinternational.com/files/file/fotobavinexuvojerav.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1p7hgid8v0i120al0ftle2dvm2/vuxubaxakedunuxezewuluw.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4fa35707a58881a28cbca712efd9506f/96256967488.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080841264be2---mokiboxakafi.pdf
    • https://cplastik.cz/data/cms/file/26351435352.pdf
    • https://securitegenerale.tn/userfiles/file/bafisovavuwekoxazevalogus.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/24466067009.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540e5d4098---34268364461.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082266029912---muwexigesoxoliriso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=runescape+3+party+hat
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73f.bin
0f9d0bd4bce9eb09c02bab2e791827c1119d1c9791b0b9227f20cd61345611d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 6960 bytes
font_01_sfnt_off0000e904.bin
d5f224cf1de9446f8bd7e5cf491a3497f66ae56b4fc1f23abcfe3a2d74480958
pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 5264 bytes
font_02_sfnt_off0000faf6.bin
1b2989f8321c3de865d85a5b12d1dbff09a12a9f8d90041f54f0b8938195524c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 12748 bytes
font_03_sfnt_off0001245d.bin
3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849
pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16116 bytes