Malicious PDF — malware analysis report

Static analysis result for SHA-256 862b7e673123880a…

MALICIOUS

PDF

90.7 KB Created: 2021-07-23 19:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6232d1bc5d67f6e54aa688667a3b6c4 SHA-1: c8d6cd31822f712a0ff9c7cbedea15024cc99973 SHA-256: 862b7e673123880af47bdf8fd42473c862220b6eab6496aeb8c877ed563a8a15
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts hosting PDF files suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a4a98e35---67935088197.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c46d87a414c1667f0b80b4b30f03fd66/mesarujivak.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/dularumivifa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b185adf3b---mibigevujuxiwezegemasofe.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/88721281777.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/q5088mge74kf8nmd6r2ksr2kbq/wopujuwavuludeb.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210714074605.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/35806002624.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/patopusilazimowamo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b93a0a2e5---nalamasaropim.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/29422269615.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09b163d45---27135837532.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd58dcba2f0---11087559647.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37c499dee763f9618fd0335ec9363666/32924225831.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c690b7ca2---ruworudugutib.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4fc31d04---sojowu.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/rubejimigoteni.pdfIn PDF document text
    • https://eventaipei.com/upload/files/zurekagupewabedoj.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gr4h2kcqv8phkfraoqvo0aj27h/kijotu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/nifasikutizaxumuzugew.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/lunevexafipu.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/rukulipafod.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/divodopozo.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/liwile.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/22bb3657d9a99936e7cebe286f430b63/92510231032.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c7d96065---47282944067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bigfoot+game+pricePDF 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_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 17964 bytes
SHA-256: e77dd87c72c37ecf5efe3da8a549aa54e989d254c8c496e592a32e1d440edc99
font_02_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 10560 bytes
SHA-256: 396136f21e236eda229b5b5af34e346207601c8486303692ae27c56238f76f2e

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