Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0c914ad13029ec…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 04:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c8b8e048995b7f94e7f5416ddfa8146 SHA-1: 36628f647b822283dd802296a8fa6003f3816b20 SHA-256: 5f0c914ad13029ece26a1ca2cf731341b746a9aa97f193a11a4f17379855bb83
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://biurod9.pl/public/userfiles/file/10783183277.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0fc2f5a7---42540436312.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/lotibutadugizizuvato.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/rusagetofiwu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109032125037614.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109081204212161.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ac42e1ca7358b4e8a11fbe8cf69dff87/dekunalipodajabuva.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/60496194056.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/pujarudesufalobefiji.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/57524585057.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/4509925942.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bb4ee020---mapaxenarazatugusiwigu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac8a00293---kebezepufalo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/52127971022.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/84370647316.pdfIn PDF document text
    • http://nineslash.com/user_file/file/nisanugad.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/vezapomogas.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d94d6428bf3a54634b4e0e24ff548ce6/disapexevobivaxaboro.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/88377865933.pdfIn PDF document text
    • http://mdtrend.hu/files/file/23561700954.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/kuzume.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/fegugokez.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/14485042776.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/gojofegaporufi.pdfIn PDF document text
    • https://e-room.co/userfiles/file/supogafegitiroloxusuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+file+shredder+for+androidPDF 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 17552 bytes
SHA-256: 08a0e3af59f238f1dc59bfe5f02cee4133a7e81fa94890352514862ba35e9f3f
font_01_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 10504 bytes
SHA-256: fe77d6b95686d18f7471150e7e41c6ea28a2a1be6e94dca8855a312cf0117bc9

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