Malicious PDF — malware analysis report

Static analysis result for SHA-256 253236c8c3530144…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 22:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 87534eeb89ecf5497ef887fc1978e25c SHA-1: c3fd0b840e3d57336c0e175282ca6e72db90cdcf SHA-256: 253236c8c3530144ba2a336c4977529b7c2194ff91cf5ed6a161c1ac1e370def
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest a tactic to drive traffic to potentially malicious or phishing content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d2b86861134e8e8f29828ee5c1e61d3c/faxiwodofepujefubovelubu.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00f188b1d---mosasewibesoter.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3bcf48bb076c83508b4f07103000e296/27097495013.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6cdc2856ba64df72caca67ab149a1fc0/fazuw.pdfIn PDF document text
    • https://hirurgija.me//files/66112596894.pdfIn PDF document text
    • http://ridendo.cz/files/file/lataz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g453h7cnsl63r70l83sm1g04pi/jokola.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6719e9fca---26726929082.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/14330145106.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jbst3m7hh1rg3bcij5sp8bfa3a/17129482202.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jagijovuroporuv.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee27bf6bf---3055840189.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/kizumagedimev.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4037a106---33019341795.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105261405.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a02d13848d34547e9239dd932d856ac7/42342469721.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/59545218550.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6944b7c90a13a86082bdef227d28ff03/97108871984.pdfIn PDF document text
    • http://cocoal.com/uploads/file/zesizazozikedufe.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/liboxerumuzunaxutu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f99989b3d207024b413d4c5630848239/xebenofonopamoku.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4ba8ed61e739868b1c8705b9fbc5bb3a/palatudifofobu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb4a771c8---94135440950.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/55324560342.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a19216e53d0882e4fba1fdb98ba9359/nowifit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pop+songs+to+learn+on+guitarPDF 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_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 17288 bytes
SHA-256: 9af083ff36e7934bc47c89d17029998eb803e80d6a0e63d4b6a001c363bd0e7a
font_01_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 10528 bytes
SHA-256: d88684fc53b680cbbc0011048868ebadb1a51cd603dd117f6d06011009b9bb0b
font_02_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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