Malicious PDF — malware analysis report

Static analysis result for SHA-256 b702596ce68d406d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 06:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 54bce295dc224eebda4578e0f89919e0 SHA-1: add4512fe1d38caac99f2015b279876a24d20813 SHA-256: b702596ce68d406d440f685100f1af18a3a5bd6e1d0d5418818155c138bbebd3
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, directing users to potentially compromised websites or IP addresses, such as http://185.33.116.145/~acus01/upload/files/69821496803.pdf. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/s15qmf96mpmt27ab76ip2jcol7/tiwamo.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b27e274fd3beb913fd4ab02564a566a7/72550529932.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/poteviwagugedororifaw.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/juzalanepufaxafizap.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/9182166132.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/57437219047.pdfIn PDF document text
    • http://yejida.com/userfiles/file/59125666232.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609138e17f7dc---6973071780.pdfIn PDF document text
    • https://expomediainc.com/upload/file/dadunupazapob.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/26519509932.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/mexugivu.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b91062b9d2778361e06b8f11b9c62b94/12537023544.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/69821496803.pdfPDF link annotation
    • http://gsemilia.it/userfiles/files/riladekovejedexo.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fenenunosexipupakazazopar.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/8196138762.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/lanofoguvimejaba.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/409e60b67b8836166d9b977fec3fdf78/28333618459.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a1a144d7---xipigugewinabadukap.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/06af5c8671920c766f0384bdade6a90c/73320619709.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3vvpsjk426oqf5da2ie0k06h8u/71673956501.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/ravuxewajejilofi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/70867399114.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/62052324542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=group+2a+syllabus+2019+in+tamil+pdf+downloadPDF 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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 11468 bytes
SHA-256: fab41ca1b3a6c03aad29ab3c7c2312df8cf7b577548e931416f32f0b5e04bba0
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 17552 bytes
SHA-256: fe460cace96122719c8ce183f7f47bfcb0be1c4b5df07fa9a5aa6b8cd3fabc7e