Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0aa42d6d1a3af08…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 20:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98b3d7c0d22d3f21eba68105a4ce28d4 SHA-1: 2b202d9ba9c6ae25a7f6bb7dcc1454b55d7fe112 SHA-256: b0aa42d6d1a3af085155f035467ca3146db1745efe377cb04f9647795057f853
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. This suggests a phishing or malware distribution scheme, where users are lured to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://abisspaandboutique.com/nbloom/fckuploads/file/dujim.pdf
    • https://novahealthclinic.ca/userfiles/file/gunemumisu.pdf
    • http://wsmr.us/userfiles/file/xupujimulan.pdf
    • http://xprchemical.com/upload/files/bazeladenupobam.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21ad9b07e---17210941482.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912f945621---gudumewabajinizafetukej.pdf
    • http://hoangle.vn/uploads/userfiles/file/68480310564.pdf
    • http://gildiamasterov.ru/userfiles/file/15642661643.pdf
    • http://licausi.it/userfiles/files/sexusigaserodiledunesep.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee5a21c863249ff45d87e020eb613/86047855608.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/raxov.pdf
    • https://sunpower.lv/ckfinder/userfiles/files/7785057898.pdf
    • http://bawaconstructions.com/editorData/file/zidewipula.pdf
    • http://3qlohas.com/CKEdit/upload/files/gexotevugugivewegivadaw.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dca3395b6---fotufopisizimijuze.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fa26256d---56147690791.pdf
    • http://innotack.com/userfiles/files/ludupumutateguje.pdf
    • http://fongyoskert.hu/userfiles/files/22259464720.pdf
    • http://chroscina.com/userfiles/file/wadorepit.pdf
    • http://fred-robin.com/ckfinder/userfiles/files/21611282092.pdf
    • http://zrdb-drogbud.pl/Upload/file/vuxebavepov.pdf
    • http://kamnitikamini.si/upload/files/57942441572.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=psx+games+rom
    • 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_off0000e79e.bin
52d59941e991cdaa13ab55185a76784e80f9be12c3f093e2be9941eeb4912067		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 10212 bytes
font_01_sfnt_off0000fe9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 16792 bytes
font_02_sfnt_off000116ad.bin
78d38dd1ce9a17da4477afcd4a79b3caa869f1563fcfada1f180cc12fcad0da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 18968 bytes

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