Malicious PDF — malware analysis report

Static analysis result for SHA-256 3361ff97d58d44f6…

MALICIOUS

PDF

237.2 KB Created: 2021-09-08 05:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e859f82b556e97870f05a91ea6b8d477 SHA-1: fb5f1cb80c50d0ec0f94f7c4f4b0243637760dab SHA-256: 3361ff97d58d44f6a4281c7f97a456133aac2274aae5345e6e75a6ea600650fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. It contains multiple links, including one pointing to a compromised WordPress upload storage, which likely serves as a lure for downloading a malicious payload disguised as a manual. The presence of embedded URLs and the nature of the heuristics suggest a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=hornady+reloading+manual+9th+edition+free+download PDF link annotation
    • http://pusancard.com/userData/board/file/wazulubobugepirorege.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/91357029110.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/55136771480.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae745560fe---zabiketipeluwinedapevet.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/51920672731.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceed423256---fotinebenibazi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oal3vipfg9dpqrhfgv676j8600/zugisasalalasi.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/sarogijuvolopewavozem.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/64806837383.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mubuvakukagoxelizegiwow.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7d536f95e406651a88c646efae4272f8/55568984060.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6r6icjq93s0a2q3t2bct61htqn/fafug.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zijagi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e92c145ab8---89358696053.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/15604180482.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108111012383574.pdfIn PDF document text
    • https://partnermind.cz/images/files/67126434236.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/57927606671.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/xejofarijaf.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a37dd3b0e---39064828918.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-5/20210805000648714453.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikarekakebesodafuretudap.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/losujotusekaxajusunaguxap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00033c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C0D 21100 bytes
SHA-256: 87c05c7f57cb1f26ebc4418bc9b844755e2df9318bece303da1061958d4d4ae3
font_01_sfnt_off000372b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x372B8 11092 bytes
SHA-256: 1a5056e8b53f30a26af1dadef4d049ccef92c8bd78e85cfe7c18f54ba595cdc4
font_02_sfnt_off00038c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1