Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f3f50d467741c2…

MALICIOUS

PDF

99.1 KB Created: 2021-07-03 10:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3ce96406cb0063f619e935d622e60754 SHA-1: 7330dc892634f060d8b3a52705f15fa0e2a3ad26 SHA-256: f2f3f50d467741c2da1790821c0bb9052a4c3607a7018b5f620237b9735ed43d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5543e7b801---99241994863.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a2de8885---difaga.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210613005754275351973.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b3f9c961---50361005407.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03af692ab1---19403958364.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed07882ef5---gomekedukisavudedupamimuk.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5um0ck2dd9pd76rsn7r82ck361/84622771727.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/18/76376252417.pdfIn PDF document text
    • https://kueapem.com/contents//files/lovegerirodiwugi.pdfIn PDF document text
    • http://beateromer.com/bilder/file/safevitumetexuduxamu.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/11622660414.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8011d163---4979275118.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/nawekurubagezisubifuv.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/bexupeninimuzo.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/69483635805.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lerimijupive.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68eeea9a3---60024920740.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/37784084627.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079045bd12ce---tasexofemima.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6a1672a577f3792e4ae62fcb66866e19/22764092033.pdfIn PDF document text
    • https://avenue102.com/uploads/file/wokudexojaxonela.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d978b3b1da---fizegumijax.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/pidajojelajikovufarado.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/82246821610.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858a3b7baeb---gusolaxino.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ecab6b912---61285320387.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3e06a1674cb4a876d31a19caac8fbdc/1601309308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=oblivious+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000100f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x100F8 23104 bytes
SHA-256: 539ec68232725c33e3d152c7162e6b1559919704868c9223eebb9bcc9f765812
font_00_sfnt_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 10684 bytes
SHA-256: fe6e0c1807188531fbe5561bea1e5d21d4ac3b0d75945b5f5ae93c8940204f90
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 23316 bytes
SHA-256: df60b9bfda0e7d86ec37605da6fde68957d7e643f4525ca12e0f50e327f96355
font_04_sfnt_off000163ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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