Malicious PDF — malware analysis report

Static analysis result for SHA-256 087cc285f15f09ba…

MALICIOUS

PDF

87.8 KB Created: 2021-09-24 04:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b02c631a66a878e7b8e2c492d727defa SHA-1: de6cb8be157f217a949149efe0c03e2c3cec097c SHA-256: 087cc285f15f09ba5780485aa5a233f9b8aca4866e620d33224664c2852f0faa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mysilo.com/upload/ckfinder/files/78355420454.pdf
    • http://giteduguedesboires.com/userfiles/file/93552204114.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d8b29b285d491aeecb19cf0907f6c177/72304309896.pdf
    • http://car-zone.sk/data/data/file/romumunusokonem.pdf
    • http://aolisenjiancai.com/data/files/xizulesodozitalizaxedabi.pdf
    • https://livermore.com/wysiwygfiles/file/35409763156.pdf
    • http://cs-web-design.de/ablage/userfiles/files/93221729361.pdf
    • http://deepakbatteries.com/uploads/file/wetuzenatimoruxisoxatizuv.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e0ec2a72d1aae9b404ce438e8bc1b1c8/wodonotokokepog.pdf
    • http://ppfi-online.com/userfiles/file/xorikiramoxetewezigo.pdf
    • http://stattus.com/assets/file/xatamubibimiwedexoj.pdf
    • http://meubelenindex.nl/images/uploads/najiwoxamuxuzulititugux.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/papebekola.pdf
    • https://trainova.com/userfiles/file/vuwita.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ce844cd6---43126104971.pdf
    • http://cieplej.pl/imgturysta/file/jupogisek.pdf
    • https://listocrm.com/userfiles/files/woviropezubit.pdf
    • http://sinoscaform.com/upload/ckimg/files/202109160046555670.pdf
    • http://life-worldwide.org/assets/uploads/files/xoxunapozirat.pdf
    • http://hansungid.com/userfiles/file/19961945177.pdf
    • https://anfauglir.com/images/file/siwuloxom.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdf
    • http://amexeuro.com/an3_Uploads/file/wegolizorimonagufi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afe8b40806---62939252990.pdf
    • http://patrickstaxi.fr/userfiles/file/6905346245.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=where+can+i+watch+walk+the+line
    • 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_off0000f2f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 16792 bytes
font_01_sfnt_off00010b0b.bin
c15846b758d83cba478a895fabac5e92a45d69a186f0c5f51c17e035ca788dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 18564 bytes
font_02_sfnt_off00013aa0.bin
cf0e455908fc7b22774280d1374e3b1e9d13694ab02104cc88364284b87d5cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA0 10212 bytes