Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1065a31ab24262…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 00:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2704d7d822df364195871e9f600ef37b SHA-1: 8afe0e7249737826da9e46d5c3ffbe4f4b1e166b SHA-256: 2b1065a31ab2426271303168477d17496585bb56f8f80e7ed6540f9ff4a9f8bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing campaign. The malformed stream length heuristic also points to exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://huntic.ru/uplcv?utm_term=how+to+get+a+skin+in+minecraft+mobile PDF link annotation
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614061e26bbcf---savuvixodivafujelotu.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/kinukufodanonuzedopujej.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/retorogepaxufedi.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/vazimewo.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/doxenutubodukexeterowo.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/58300959314.pdfIn PDF document text
    • http://zzquansu.cn/d/files/99604032348.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/44337466811.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/sogewajonor.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/54827040842.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/27557880663.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/62545830050.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/52686449796.pdfIn PDF document text
    • https://best-label.com/upload/files/webime.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/20967330931.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/3aih8g9d7hfe0r6l9subihek28/12891181756.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b86766e2---87166444834.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/66633861406.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/nukobibawosova.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/83089576538.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/49494416445.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5b7722678c7274c244613c0f61457ea2/gikevatapis.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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 10988 bytes
SHA-256: 01cef387a7ca6905935cc12207052da1e6da68ce50a6256af9823596b52010a3
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 18396 bytes
SHA-256: 2b5d6dc97728a3e6287f6cc7fa371fe2de0161c0276bebc0f1b9b33ca35c52a0
font_02_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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