Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c528ea9699a75…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 01:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47ef21f7d11f3040429ff8cc9ababcec SHA-1: 32c6f17bae9d14888e53649029c8f4f60dceb6c8 SHA-256: 6f5c528ea9699a75cb7aaaf23e4d314dda9d379e00f793444e90c3d6f5f60411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised CMS upload storage and disposable hosting, suggesting it is designed to redirect users to malicious sites. The presence of multiple links on potentially compromised or low-reputation domains supports the classification as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=acuerdos+de+paz+firme+y+duradera+pdf PDF link annotation
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160850e4e3a7bb---19715913762.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/95777296622.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610e000cc9063---riwusu.pdfIn PDF document text
    • https://citytrafik.nu/images/file/8152908610.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/velufegovopo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/30dbe0772bf2e3996f7fe04ebe8a6bb5/85620423969.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c900064f6a6---rawixabulatiwomisupito.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/lajajekikupakotaj.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/78881977511.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/13423195597.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5532c06c80ec6c041185dc8f814c58a3/gevedemasonanebibemiw.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4296895302da14e5a395915b78ac3ce3/72507269574.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/3129733504.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4555410d2c---rapisetarogola.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/fibotoxubodosiped.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kabalipap.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/44094282449.pdfIn PDF document text
    • http://juentai.com/userfiles/files/dowotopebuxuz.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/22900204884.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/lapafemazej.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qalmbvtks2k5m4ere8q5jrba6s/16138921488.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4cb5ab16909c20754751b47740121685/73083436895.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe403915c---65870809784.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/80406312732.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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 10788 bytes
SHA-256: af5a20bbd5ef9b366a3cacac78bfc10e6685ee6088d00d1d551d5106411485c2
font_02_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 19884 bytes
SHA-256: 4536abaf356c802f18f1566abc6e26ea38c854ec9c6a6effa2d44f6962955d7b

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