Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd9dc5d7f63be88…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 00:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746f8a1e17f8a9de0d79d8ab42ea604b SHA-1: 28504c18b74536215cf2b942c072b65690d03236 SHA-256: cbd9dc5d7f63be88f3c3d0db87addabacc03a6dad1a9897c890e1f51c3aa32ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs embedded within it. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no executable scripts were found, the structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://aelma.com/sites/default/userfiles/file/ponakegodikozidipisenibu.pdf
    • https://luminex.pl/upload/file/xulowuzovewumuvow.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/eqifffgd4q8inniquh7cn0b4a5/8273097494.pdf
    • https://resonanceacteurs.nl/userfiles/file/56004485352.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369945960d---13603517096.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d3ff7e8a0---49256004139.pdf
    • https://people11people.gr/uploads/File/29417183902.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b0aa6026a3ce3b9d62fecca4aac79aad/bibulizupejelus.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca14061f1---winulokuwiwamim.pdf
    • https://nadamasristorante.it/file/10195389035.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/2bfcbdc77aa3db31af9cecabf5b517cc/75585969334.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716d7dab5ac---wisotiwinegizobixadevisox.pdf
    • http://dongphuctqueen.com/upload/files/44934256543.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ecjqke09dtps8lf9pdk75r9ran/rufolupepefefarogig.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/67880044940.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3cc2608b31217fb2c1f63a7efdc950cd/milepedo.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6b2cecb3edbb2d369c1b809192f8f00/bemaxakudefitomes.pdf
    • http://terminsk.by/pics/files/xezevuwu.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e2a5feca9e1dda246fb012c2b1403ae9/vikilo.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13e50dba2---pideviperiloxub.pdf
    • https://aedwea.com/upload/foto/bosod.pdf
    • http://helloshoppingnepal.com/userfiles/file/todizarevox.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607331bde4288---bulejumamuvegoto.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/79bd4cebb400d4f90a5decae05f8ea3d/31781260354.pdf
    • http://www.rify.us/cms-uploads/files/70608065024.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cvtsjnrip1j6ak6q3f3qlnju73/17105605749.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e654e035ed---duliveroxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=check+for+power+cuts+in+your+area
    • 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_off0000f70e.bin
11a8be12660c2f2d1bedd7e4af94c341e9a370b283cc29e9696b57887539c7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 10952 bytes
font_01_sfnt_off0001108c.bin
3936cffd3beae996f06983162d877ae8f92b0325a0c40deecfb2ab7dcb1f0c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 17304 bytes
font_02_sfnt_off00013d8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8D 16792 bytes

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