Malicious PDF — malware analysis report

Static analysis result for SHA-256 058ee191c984e06a…

MALICIOUS

PDF

112.7 KB Created: 2021-08-17 02:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d77570fbb0ef65343ce684b53afdfd5d SHA-1: deccfe2bdc50f57d61e7178baad28b8791bf8b4f SHA-256: 058ee191c984e06abc8e487de076da11e68551b6b0c48fac0a843c91b8d9cfe5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/41e5d8ed98d2b6b9ef22c72cc17921b2/kowezubudedesuw.pdf In PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9a76c685925ae4cd5fa6422e71b8ded3/94983206403.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zavaxofevazize.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/mubepegasemupujoto.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/04e8b042ba16221e84f895d8c3a4d640/77105333870.pdfIn PDF document text
    • http://unsersohn.ch/images/file/dodixoxupufibomuvafuz.pdfIn PDF document text
    • http://agrimal.pl/userfiles/file/31786747627.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/63756758849.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4457e9def1---vawanululaxononuzopijaso.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/9831065256.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc63ebddb1---lagejupitofogepidafiw.pdfIn PDF document text
    • http://ibliberia.com/ckfinder/userfiles/files/23870186690.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/76231371765.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d3ab7bae40f2e171a249965f8a6ddec9/mubamowuwodexegezosuzafa.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1b6b2db41310295820bd60c750eb9ef6/61165171751.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5d9d319e310b4d7ceae955ee64d2e1d/55129285269.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aeebcaab5---vubazoteloseb.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739e4d77a40---gufinuxab.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a334c4b611---75766196879.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vizuragis.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/kizadatuxuz.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6295bd3876---57949837210.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/71739164829.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/mebukutujane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=padi+open+water+diver+manual+knowledge+review+2+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001543e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543E 11200 bytes
SHA-256: ae71837dff279cd01294bd428a13f349fa59caa85f273104e26e011728f3c3b7
font_01_sfnt_off00016e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001866d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866D 16736 bytes
SHA-256: 63a6be3f246e4cb800264a13842eb9309cc921dd53b4e534b5785c7081d35859