Malicious PDF — malware analysis report

Static analysis result for SHA-256 370b63562601e87b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 00:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3c6e160b754dcd28ec4cda089571c35 SHA-1: fbe671b3a76e0becdef737022986be00c03d8dfe SHA-256: 370b63562601e87bb558ac03134552c285b097dd345d207bbefa50840d69f4ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's purpose is to host a large number of links, potentially for SEO manipulation or to distribute malicious payloads via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/442vabr6rc184f37uqpn6ot8e1/15421134677.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16118f39d76b63---pakinaxonefi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5kcuabja1hec4js7a9fo1uvdf2/21847772467.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-14/20210614152629770464.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/garigakujop.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/suxanapakagikebewuludepo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e8f9e64e1---xuwiruw.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/wubiwajovofegezinifar.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/moxoj.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9303858f6bdd82f5515c7b7781a40cd6/53469069213.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/loxepafevax.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4893106317.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/gekemuviwopozuwemog.pdfIn PDF document text
    • http://donghotam.com/luutru/files/wuliserowipixurijumonikuv.pdfIn PDF document text
    • http://status.cz/UserFiles/File/semekefatiberak.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/88790779127.pdfIn PDF document text
    • https://spark-care.com/userfiles/file/94795065064.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8d7f4044---masarirulisidate.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf96582b27---gixafaxid.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/lejidibelunapomizesuravej.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/jitukijukoluruledukufezug.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/93792558131.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c060c9b5---50905871451.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d21db331b8cf6e5854c2b4e9289f72c4/96434030503.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/zukozelakut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=that+was+earlierPDF 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_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 16676 bytes
SHA-256: 50ea7bed8879e6ba5afb3a5d650a2424d37e67605db3a5ba45d0aeaaa561ddad
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 10032 bytes
SHA-256: e379034a4a7c4d077c8c3e29de9fd34e0b3f1f7b30ee1479cf404baaa157b594
font_02_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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