Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e42152ed7505d2…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 20:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c354cac863023c9ad80d004297a2e62c SHA-1: 5632f68e7480dc81690d13f248260a2b8a2f19cd SHA-256: 33e42152ed7505d20fecf5e4023f64aca8bfc484f28ef93738e757e2ea30a2dc
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=games+that+are+not+available+on+play+store PDF link annotation
    • http://sevinctekstil.com/resimler/files/37068777480.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d11084556d6788106f6fd200ccbe3245/fegujavagonibejonofami.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/68350003767.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4d1d6a705936dd3b90f12cbe7a291a04/43400099063.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/vasotabedudabegimob.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0518191d---tuvigimivozixokalag.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/ropapevurudo.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/47754617604.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/e138epbse6vbnfk1no8odtqth1/6097764912.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bomaruzigabutifolitesora.pdfIn PDF document text
    • http://www.agot.pl/upload/file/50775909884.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ccb873454419a04ff3e91966267a3c2d/tafitixemukozinozub.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd76e982f---72220871793.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/deruxukozirov.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/71970695219.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/kijuja.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/67414848590.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/jovebibigobisofat.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5eb91f0b---fuvabanifexavovilufolige.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/83597303329.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/99845079907.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6e08e4bfb6fc2cefa6efa494eaa325d2/nogotefezabonukidizalimin.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/91040156403.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_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 10876 bytes
SHA-256: 1fbc059a10bedb30614b3115c34fcdf0184d79d98c83689e42008f8bb0ccdf7d
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 18372 bytes
SHA-256: 8a029f80fbc703b4c62d98d93e2dff09ab20f4c81f1d4bec1511ac8709f4812b

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