Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd11b68fbbc5af04…

MALICIOUS

PDF

96.6 KB Created: 2021-07-07 06:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc29d51491ba359005a35493805f65bb SHA-1: ed4f488d5d176eb82b9e68e5b3c73b536149dd9f SHA-256: dd11b68fbbc5af044dec045384792981e8cb6692cdb3b648f7e1a8e5da764d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://philabc.ru/uplcv?utm_term=mild+hydronephrosis+meaning PDF link annotation
    • https://soltendance.com/stockages/files/tefixes.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/30bc3bc15b15dae5371698adb9aadb40/xuwele.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/96357315051.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609167aa449e6---53703957898.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/8882a71d0651a32ac1ef25f74892e502/papekix.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/fezapa.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/52810408024.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d61ba2161---filibej.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6564278c6c177978a0e9ea611466f35f/64722534208.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160733d9a07565---vivogaletunof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c210616b3f1---80814248243.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/45700002937.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cad62afe---kutugogedupisufoz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b8b8tmctjcr4ru3hk7m888uer5/pigevuluribajopar.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc916ae7b3b---nibaretubakomu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ad68b51ed3d105a032265ae264a0bf2f/majituridaj.pdfIn PDF document text
    • https://ecoretras.com/file/6154799442.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/28f36367590799b497e0cd504e069c14/ronuwelupikemi.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/xisokazete.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ec5c65c3---kagozugarijiz.pdfIn PDF document text
    • http://yoron.net/up/files/26839442482.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2764f171---21679212628.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb733791fdd---42821726741.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/nadawevajut.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75326ec44---75632257324.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_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 18056 bytes
SHA-256: 3ceecd334ec4a007d4a229520c0adb8c08a24416c308883167c357ea182bf141
font_01_sfnt_off00014474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 10848 bytes
SHA-256: 0ea0890b5112fae2ecac3249ca02f38ae5e245d7f3a315ef6e3176682ca7f982
font_02_sfnt_off00015d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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