Malicious PDF — malware analysis report

Static analysis result for SHA-256 6777d8e9d3bdfa5f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 02:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d1e072003e5d651bff9cb16890c57b7c SHA-1: d76537e7cadb994dcab1c0f3e148e9c3788161fb SHA-256: 6777d8e9d3bdfa5f17b202f820fbb9c83e743117b3cd30426f30c607865e6bd8
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://cgemfoco.com.br/ckfinder/userfiles/files/54573974181.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/49b96900ecdfb1d6b9ac7400ef6420ff/tixadisabijogoximojobovuf.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/80e37397a4b5c59f5de537b6da6679d2/gajetukitim.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f263c6d62---26140265593.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xujev.pdfIn PDF document text
    • http://aweibel.com/Photo/file/63248046997.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/53173757543.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/pomujujilowupika.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/67563133198.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5adb9113b---bejowakupojunajubos.pdfIn PDF document text
    • http://fruitvita.com/files/files/12899738750.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5211b10ca---45400839574.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/nizapiratevibutemodavuf.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ae17a9b928c1e60917e99727751ded8e/4480605841.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wizupifiv.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/wufarokasevoledov.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/434e9b9518618624d2ca463bd75b0a63/wonesepubajor.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/99631988413.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/bividitute.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75f96713d---dinuzorejoduperejuger.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/5361193032.pdfIn PDF document text
    • https://12shio3.com/contents//files/siboxi.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/86974904622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=after+effects+gaming+intro+template+freePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 17048 bytes
SHA-256: 987a0bed6455197b0a47aa309c37394fedc2866823d3e322a863faf4eacc5543
font_02_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10804 bytes
SHA-256: aebb2e0e3c5d8c57cc22d2882c71be80107282306c45ce6591e3f5e70406861e

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