Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb185493b746bbee…

MALICIOUS

PDF

97.8 KB Created: 2021-06-28 13:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef8816896e9c873e49737de58d94cf4f SHA-1: e034fb91fddb5df3600715b6ff1210fe044e8c2b SHA-256: fb185493b746bbeec8134595982f87f4a3ed82284990ab570e675744232660a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://palami.by/images/file/94743409286.pdf
    • http://gelateriacool.it/userfiles/files/raruvonarogetiwikavo.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160963c6b12f37---rofen.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16079a80359279---29545702792.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077562c7ffda---13140481542.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3022b9a919---siporewiwusetiputuwul.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608031941c5a8---39204899965.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1329867ac7---wuxokijiguroxunowubejitex.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210602170715.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434051cd42---37581811045.pdf
    • https://info-jimukyoku.jp/lot/upload/files/vawifilob.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4e95kls9qudp33uliunelhvsvm/desizesoxiduxavugugib.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a5c3e046---kijavosawara.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080ceaae5ffd---lagalukofopuxupuf.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r58bl3l7d45239sq9dku1i0r8s/15265800313.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56bea23f1---40242715956.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3kri2t35b71ktrqv9lam7pvcvs/83259060586.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/h79vvckj3kc10j72j0j9shncpk/73460085838.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/24001facdce56064d455f5c2c8fabc23/5496805834.pdf
    • https://wfca-czech.cz/temp/userfiles/files/kesipuzetabijinuk.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986c481953---3148667810.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9565e9ac---zefafewomupapojaso.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xixijugetupisigebipese.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/41e31bdb6af71b7b868ff1f9853b117b/16005393231.pdf
    • http://jshtextile.com/UserFiles/file///95252288538.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=stop+game+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f0.bin
190a3efde23b010e79aca1a31061a0d7fb6aec68277198cf54d547e63e384f8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 17596 bytes
font_01_sfnt_off00013194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16792 bytes
font_02_sfnt_off000149ab.bin
c50f257934baa4566e58932cc17cb85ec8ec74e277b69e58696f5258ec6d8b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149AB 10620 bytes
font_03_sfnt_off00016205.bin
e41b550eec9658e0153ae0951847607a6407864402a49e4e55c4c698be25ccc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16205 16952 bytes

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