Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc2cb87bfe618c7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 13:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43f887289b832b00cb0987ff7d05ef3c SHA-1: 165c9901cb5d6b1ab301a74a672ec5619dd285ed SHA-256: 1bc2cb87bfe618c72a253c2cedb4e2c9e782a8552dd97a7dddd234aeaa2cb54b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO poisoning to redirect users to harmful content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=tron+legacy+wallpaper+android PDF link annotation
    • http://studiocastigli.eu/userfiles/files/24746656281.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/mixabugevomefun.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/88423244793.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/romurata.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/29308208416.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/kasexagizexadojivuvasif.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lpd0op435ctv6g17f9u0q7b83n/rulowibisidilevi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd8c905f85---wakabudug.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/fupijafini.pdfIn PDF document text
    • http://dothi.info/images/files/48108501576.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/56020155680.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/putarogagufegifugived.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/miwodojudu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/pisuvegezebek.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aab8ffae746fdd77cc73261d60169c70/51601418345.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/13688950846.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecc87794df---fedelubonumim.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/34458555109.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/tuzuri.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e4f9349ddd69fc855f7471a1837277c5/detumokaramipezekiju.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/bff8e5501a72ac8a8524397727b64092/56794316666.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ssrv4l032gngukmrlh5t1sq2l6/waluja.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/boxuv.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/jirawufusujadimizekeb.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/12943859986.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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 10588 bytes
SHA-256: a93ba059c4613587a22415baa50751e0f3a5d75e67872be36db40640a9b58bfe
font_01_sfnt_off0000cb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 15496 bytes
SHA-256: 54e36b7580d59ad4f072753a3789179127e893273e43758dc23459d49fbdff95
font_02_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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