Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b5242559a3324…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 06:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 710254e573ed87fe01b8f0e68da9d307 SHA-1: 32c1c444fc954199a3c585a215216cf09f5b91ff SHA-256: 927b5242559a33240966fc7e2735a7565d0382bb131bfea75a80e4fcc12e2697
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with SEO-optimized terms, suggesting a phishing or malware distribution lure. The presence of 'cmd' tokens in the document text, along with external URI firings, points towards potential exploitation or command execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://cructi.ru/uplcv?utm_term=serial+number+office+365 PDF link annotation
    • http://dintainoodle.com/uploads/files/97728744058.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/38519266660.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/47818187492.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/doxuredodovaridatejaxogo.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/40259722532.pdfIn PDF document text
    • http://rococosofa.com/files/files/forarebeje.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/51097176013.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/joxifowizofu.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/getirimumonirureluwonago.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/5577791181.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613779533f46d---62930582304.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161354ce0e79c5---30876744879.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/numifikupenorut.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/dilujitax.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/94029234761435b4f1eaa2.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090619454273499.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/23931292417.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/84793302825.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/29ichiqpg3osgc7tqmmcmdi04i/nujofekirivilewutizanuwi.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/adedc1c45e7290f1e10d869e4d552768/luletabefekekupu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad1474206---1858594830.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/pivonetirufu.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/37976812618.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/dapeji.pdfIn PDF document text
    • https://www.horisunmaurIn macro / runtime command snippet
    • 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 16792 bytes
SHA-256: 5e6391bee1aac49ed33d68315c565681c661726a48eed43973ab7c41c94d86c5
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 11020 bytes
SHA-256: 9404193d91959d9bb75a14b5aa453fec2b69e02414051fbeac6faaa909743b14

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