Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f6a98432b43887…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 08:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fb40eab6d6b722575cacded78b47783 SHA-1: 7f82a8892d98bbd48e151c81f8561fc519aa2f45 SHA-256: 71f6a98432b438871796152f86894ecc144a99645b8c6de41ab5adfa9a567d53
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of multiple unknown URLs suggests a distribution mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d630888586---45839086843.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160950f868e29e---guwanelutilaramotu.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/50990121879.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/semopemijafamesidojixebe.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e29a343bb517447bb86e1f2649ae061e/damasujiraxipukuxab.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c3ec5ad4f3044afe53e1517fb5f65d3d/kolimifolipabefufavak.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c248ca3f9---51092923087.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f714927bc73fc4872cee445b9999a198/39971568666.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072be5dea2ff---lotipomujavozofotevasubow.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/86119599636.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf22bd0e39---gomiwi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kirarukakejuzirebugapek.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/41544466335.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e35518bf62e30adc6e6ba16e12df3b75/10049132688.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/93f2cfce2408b84e62f1d2633b13101d/59685477062.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/61112711478.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8882ab377e63a2257733940eb836a799/vurekozinuniwasenomer.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17a6e7737---mibofiveresutivumabo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/fafa8b05aa5a99f6c313ef5cb09d0000/87495844873.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a39efd954f7---71845839164.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d799fa59949---40012058338.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/laragomeja.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e6f8fed2---fitokuzepufuzaneso.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16086335636acd---80717318258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=veracity+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_off00012926.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12926 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 22696 bytes
SHA-256: 386d06a5e89e06bcf523ed7046b2c71417f2b1693ea6f73b7ebdcf673f88f10c
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BE 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off0001543e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543E 10368 bytes
SHA-256: 0da04b9376a1eddec7beabc6d7193b28235604f7228592b875493e030ff87e17