Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae900166c0097f24…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 19:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5098a52bf8e46bd15c9374ccf05ed002 SHA-1: b34b9a8d399d55b520ded80120188f4b7fc4d2c4 SHA-256: ae900166c0097f2439d83a44682db015c345cda10e6545cf811e2fe86f239748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/38188755e0664288e3963930ffd08039/74713681087.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abe092363---42874801130.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/43a447a6f88d2cf7bb7caf688398038a/netitinag.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95af93e4e---zitonumulebane.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1267ac73457f33f91e90b7602fad44bc/52705548134.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-29/20210629194650995296.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8461_20210623181147.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bfhi63eedegkd44tpnhob5ualk/68006758765.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/fnusfe2kk3f6m99u552kv48h75/50965463535.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88c60f2a9---kepetuworezuwidemuwopoxi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/086e0c5766cee168f250332b0b380e23/pezejajofeniwunawe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/lizejibo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210702111351_1028268258.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6f442145fb173a0c14154e66ba96a69d/17361907161.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160818e064a934---3156406995.pdfIn PDF document text
    • https://bdcomunicazione.it/file/fimewusedofeforebuter.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vinajesevul.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/kobisa.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/dubarenidebajokewaxajisiz.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/40543442424.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/dijexawudujaradiro.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/94695893817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+biographical+filmsPDF 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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 16980 bytes
SHA-256: 21080a2b3c762817ae7e1cfeed78b4496b30b9ae98b8f6a69c33d1f91e1af357
font_01_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 11016 bytes
SHA-256: f1789f1cad61227917b36ec3fc1ed03bf698f6b5776706b995764d29289968a2
font_02_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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