Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f6c09c065283d1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 03:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c41539a8f5d163e70cc214c96c64872f SHA-1: e27c26754f3e313cf77071f7d5f2a4814f80a04f SHA-256: 16f6c09c065283d1a613331c66a8fef45d84aa89a1afd5711957302d42aa46ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://coretry.ru/uplcv?utm_term=surah+an+naba+dan+terjemahan+pdf PDF link annotation
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/140547070531fe4b473f3a567661f87a/90733623816.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/55291597396.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/fumenuxisajafisitodepim.pdfIn PDF document text
    • https://bnovum.hu/downloads/63765337960.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69c558b02d---94800672426.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/dezexumokumodokeve.pdfIn PDF document text
    • http://poorclarescork.ie/images/32608688678.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/tenixevijevelodomodotojeg.pdfIn PDF document text
    • https://fototipia.hu/files/files/nimawin.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/41045072352.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0cb0382dd---56173887998.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a1b9a15a---23706051059.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/riteruj.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///18440243627.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/dcfc8c5428048abca197b45f3e86a0b6/mobup.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/26747396502.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/4670ada69111cd2c51926c416d5b0500/xafokavenevafu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/90123885510.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6b5aafe1d---zepafemaxeduxusired.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210621121928_778972332.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/oej2c4beol0kk6r1pnron7mca6/tavilaj.pdfIn PDF document text
    • https://kildevangen.dk/files/jasafukive.pdfIn PDF document text
    • http://mobiliteit.nu/files/14369120911.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB782 10784 bytes
SHA-256: 41a77a4e37f8982cae2a464a0ffbcc4fedb6b63086c83a69641b5ed235c78bd3
font_01_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 16520 bytes
SHA-256: d932864256c63e80e8d9defe94c2bd629a5ade3367900a2ca55bb71fc3241191
font_03_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 20476 bytes
SHA-256: d7fdba10124d139e753c9bd9caa36bdcdd9f77ffca899e9a5eb95f73fca2b58b

Open this report in the interactive analyzer, or submit your own file for analysis.