Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefa9aa8b30878c0…

MALICIOUS

PDF

89.7 KB Created: 2021-07-08 11:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cbe6b03be7d31deefd008a03649564cd SHA-1: 4e3bef328867a7789bced9fa8a8436e8bf22be62 SHA-256: fefa9aa8b30878c04cdba45efaa9dcd98a63fa6c962893244d402d7e6d6c2fa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=hotel+and+restaurant+management+majors PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d047bc52---likawolepitaroxilowegi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57d3a7198---fopinukotoniwo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/fikipinuveneberuvo.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/sigejovitigoraludit.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6a694be922726d87dd3b7e4891564cbb/fowozasimipe.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/9395809793.pdfIn PDF document text
    • https://tantecoccole016.it/file/24322156795.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/97005180240.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/53517125013.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/divodox.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/2309d538f227b415aa8fc899c8e40957/joselajes.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/biwotofelawe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/45242946519.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609457dbd5f5d---12547339774.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b918a9cea9f---degefowoligadeferulemu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/85311897476.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896d51bd16---27114244549.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rk151912nigb9okp26nrlel6cp/62727765111.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4bac110bc5d14f531478766d672eec73/zuvoka.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jizevevariduku.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/51758365081.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 16896 bytes
SHA-256: 446a442c25e1573016df5c88fb99036d7463e68d5317f96fb554468e2539a8a7
font_01_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 16336 bytes
SHA-256: adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000140dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DC 10720 bytes
SHA-256: 6761b08a8ad52bdfb8d166be129fd58395d7fd7f22e812e24735b0ca63cf41eb

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