Malicious PDF — malware analysis report

Static analysis result for SHA-256 c499ce5e7178c004…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 01:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efe33a3da6a3e0fe0d0153bd4c70ba3b SHA-1: 48021ddd377255194a6ef6d199393f535acb4567 SHA-256: c499ce5e7178c0042b1a55dcc93b879040487525ffd287ad7dc958d7af85f4f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ca28e424e730852789ea2fee239fa257/xifobunupugeragid.pdf In PDF document text
    • https://kiameds.com/images/upload/files/fuzapifavan.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078241ca1284---71989658971.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a75a69acc25c2a09ab59564e5694c83e/51057363008.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/wixowipumuxugizi.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a33e4c110d7963ca09c0458ecd7d6fc1/43205399048.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b10add38fa8---5121299274.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3abb155a78---27779553694.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce83569d97---nadudukarowegofovopeno.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/62841310712.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/lapalekelitijudofukiferu.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/kuvinigumusetuvijed.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/t7g8omsnpsdvtpcgbdn1ne3itv/23228750100.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f1e9400fa---44671405010.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/te3ppn86a4crcvlm6tk6bv6al5/makaba.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/n2ikrf10c6bj47kq70kj6cvc58/66647589848.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tilipefibozajetepitusekux.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c124e2ec9aa---xoxerid.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181ef20373---bizezazijinizapoduw.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/vesopegitumanaxoj.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6aibk117l6pqjhks61i5r7n8u7/17058891714.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/86477707688.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/fuluzojojinalog.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5cb67c625---35040214391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+parker+inheritance+charactersPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 18212 bytes
SHA-256: 6b0bf2af2f0af2635f0db74ee87d8008abf436053affaf29438f8476b8f692d2
font_01_sfnt_off0001389b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 10360 bytes
SHA-256: b7166e3a739f034b960e7b03dffcbfcb2c36dfb00e4d42ef04715e509319a862
font_02_sfnt_off00014ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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