Malicious PDF — malware analysis report

Static analysis result for SHA-256 0427e393887a1c6a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 19:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95f24b510f9e52106f16bbeef441d1a8 SHA-1: 3e1b1b29803903f8ec3ba829477d034c5c14fb71 SHA-256: 0427e393887a1c6ac4ce9b6089f29f31ab5f2973c54529b995502e762337e118
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130912171278---22836674352.pdf
    • http://sententtech.com/file_media/file_image/file/64859709590.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0f283006ecba5a5b64a57bac04dff90b/28321728048.pdf
    • http://gldbirdgel.com/user_img/files/51458624809.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/mibozegodawomovobu.pdf
    • https://mimpi1pusat.com/contents/files/ledimomutiroxe.pdf
    • http://soyaksiesta3.com/userfiles/file/kufaj.pdf
    • http://chuaphucluong.com/uploads/image/files/namogux.pdf
    • http://asude.istanbul/ck_images/files/xasavixabafutaxijo.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/42999388321.pdf
    • https://accounting789.com/ThImg/file/gomemobix.pdf
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/3153291045.pdf
    • http://fujavietnam.com/images/Download/vobamabisujotatid.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1c9835bd7a7dec60b57de8c88ce08c46/80200883803.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161403c028e22c---lalanazabawuberek.pdf
    • http://nujhimachal.in/img/uploads/files/87661345904.pdf
    • https://gplacestracker.com/userfiles/file/6478366545.pdf
    • http://papierplus.pl/userfiles/file/66834548.pdf
    • https://laznia-radom.pl/userfiles/file/62961234276.pdf
    • http://peoplefoster.com/pliki/62996180788.pdf
    • http://tehnicgaz.eu/files/file/dudijikiwusuda.pdf
    • http://bakefruit.com/uploads/files/202109151209475835.pdf
    • http://elsped.hu/files/file/88263263374.pdf
    • http://premiumcsp.com/uploads/files/68677108021.pdf
    • http://9275522-travel.com/userfiles/file/vejemavubujozidanipufoku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=installation+aborted+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 16792 bytes
font_01_sfnt_off000100f0.bin
21293ad19dd91b474c4f5b9b39f57a674010f0e66905af3867e5932de727c9aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 18276 bytes
font_02_sfnt_off00013044.bin
190d58ac845db8b58cd759ddf185d9bd707643a729d11a0e807de2150b81cf24
pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 10332 bytes